File Specific Analysis- PDF

gw:TotalSizeInBytes

The size of the file passed in for processing

gw:FileType

“pdf”, passed in through the Glasswall API

gw:Version

Read from the document’s Data Stream Header

PDF Basic Object Structure

This content group reports on the basic PDF types:

• ARRAY_end
• ARRAY
• BOOLEAN
• COMMENT
• DICTIONARY_end
• DICTIONARY
• NAME - NULL
• NUMERIC_INTEGER
• NUMERIC_REAL
• POSTSCRIPT_EXPRESSION_end
• POSTSCRIPT_EXPRESSION
• POSTSCRIPT_OPERATOR_ARITHMETIC
• POSTSCRIPT_OPERATOR_CONDITIONAL
• POSTSCRIPT_OPERATOR_RELATIONAL
• POSTSCRIPT_OPERATOR_STACK
• REFERENCE
• STREAM_end
• STREAM_GRAPHICS_CMD_PAYLOAD
• STREAM_GRAPHICS_CMD
• STREAM
• STRING_HEX
• STRING_LITERAL
• UNSPECIFIED

PDF Compressed XRef Structure

This content group reports on Compressed Cross Reference Table

PDF File Section Structure

This content group reports on the high level structure of the document:

• PDF Comment Section Instances
• PDF Cross Reference Table Instances
• PDF Header Instances
• PDF Object Instances
• PDF StartXRef Section Instances
• PDF Trailer Section Instances

PDF Graphic Content Stream Structure

This content group reports on Content Stream Structure

PDF Object Stream Structure

This content group reports on Object Stream Structure

PDF Trailer Structure

Not used

PDF XRef Structure

Not used

Common PDF Data Structures

Data structures for text strings, dates, rectangles, name trees, and number trees

PDF Annotations Data

Associates objects such as notes, sound or movies with a location on page

PDF ASCII Filter Stream

Decodes data encoded in an ASCII hexadecimal representation, reproducing the original binary data.

PDF ASCII85 Filter Stream

Data encoded in an ASCII base-85 representation, reproducing the original binary data

PDF Catalogue Data

References to other objects defining the document’s contents, outline, article threads, named destinations, and other attributes

PDF CCIT Filter Stream

Decompresses data encoded using the CCITT facsimile standard, reproducing the original data.

PDF Colour Space Data

Specifies colours of graphics objects to be painted on the current page

PDF Crypt Filter Stream

Decrypts data encrypted by a security handler, reproducing the original data as it was before encryption

PDF DCT Filter Stream

Decompresses data encoded using a DCT (discrete cosine transform) technique based on the JPEG standard, reproducing image sample data that approximates the original data

PDF Embedded Font

A font program can be embedded in a PDF file as data contained in a PDF stream object. Such a stream object is also called a font file by analogy with font programs that are available from sources external to the consumer application

PDF Filter Predictor

Transformation by a predictor function, which improves the compression of sampled image data

PDF Font Data

A font is represented in PDF as a dictionary specifying the type of font, its PostScript name, its encoding, and information that can be used to provide a substitute when the font program is not available. Optionally, the font program can be embedded as a stream object in the PDF file

PDF Function Data

Function objects that represent parameterized classes of functions, including mathematical formulas and sampled representations with arbitrary resolution

PDF Graphic Content Stream

Sequence of graphics objects to be painted on the page

PDF Graphic State Data

A PDF consumer application maintains an internal data structure called the graphics state that holds current graphics control parameters. These parameters define the global framework within which the graphics operators execute. For example, the f (fill) operator implicitly uses the current colour parameter, and the S(stroke) operator additionally uses the current line width parameter from the graphics state

PDF Halftone Data

Data related to rendering grayscale elements on a bilevel device.

PDF Huffman Filter Stream

Decompresses data encoded using the zlib/deflate compression method, reproducing the original text or binary data

PDF JBIG Filter Stream

Decompresses data encoded using the JBIG2 standard, reproducing the original monochrome

PDF JPX Filter Stream

Decompresses data encoded using the wavelet-based JPEG2000 standard, reproducing the original image data.

PDF LZW Filter Stream

Decompresses data encoded using the LZW (Lempel-Ziv-Welch) adaptive compression method, reproducing the original text or binary data.

PDF Name Tree Data

Serves a similar purpose to a dictionary—associating keys and values—but by different means.

PDF Number Tree Data

A number tree is similar to a name tree, except that its keys are integers instead of strings and are sorted in ascending numerical order.

PDF Optional Content Data

Sections of content in a PDF document that can be selectively viewed or hidden by document authors or consumers.

PDF Outline Data

A PDF document may optionally display a document outline on the screen, allowing the user to navigate interactively from one part of the document to another. The outline consists of a tree-structured hierarchy of outline items (sometimes called bookmarks), which serve as a visual table of contents to display the document’s structure to the user.

PDF Page Tree Data

The pages of a document are accessed through a structure known as the page tree, which defines the ordering of pages in the document.

PDF Pattern Data

Data relating to items such as a repeating figure or smooth gradient is called a pattern.

PDF Resource Data

The operands supplied to operators in a content stream may only be direct objects; indirect objects and object references are not permitted. In some cases, an operator needs to refer to a PDF object that is defined outside the content stream, such as a font dictionary or a stream containing image data. This can be accomplished by defining such objects as named resources and referring to them by name from within the content stream.

PDF Structure Tree Data

The logical structure of a document is described by a hierarchy of objects called the structure hierarchy or structure tree.

PDF Threads Data

Some types of documents may contain sequences of content items that are logically connected but not physically sequential. For example, a news story may begin on the first page of a newsletter and run over onto one or more non-consecutive interior pages. To represent such sequences of physically discontiguous but logically related items, a PDF document may define one or more articles. The sequential flow of an article is defined by an article thread; the individual content items that make up the article are called beads on the thread. PDF viewer applications can provide navigation facilities to allow the user to follow a thread from one bead to the next.

PDF Trailer Data

The trailer of a PDF file enables an application reading the file to quickly find the cross-reference table and certain special objects.

PDF XObject Data

A transparency group is represented in PDF as a special type of group XObject called a transparency group XObject.

PDF Web Capture Data

Web Capture is a PDF 1.3 feature that allows information from Internet-based or locally resident HTML, PDF, GIF, JPEG, and ASCII text files to be imported into a PDF file.