Xpdf

Xpdf is a free and open-source PDF viewer for operating systems supported by the Qt toolkit.[4] Versions prior to 4.00 were written for the X Window System and Motif.[6]

Xpdf
The Xpdf viewer
Developer(s)Glyph & Cog
Initial releaseDecember 12, 1995 (1995-12-12)
Stable release
4.03[1]  / 28 January 2021
Operating systemLinux, Windows, macOS, FreeBSD, OpenVMS
TypePDF viewer
LicenseGPL-2.0-only[2] or GPL-3.0-only[3] or proprietary[4][5]
Websitexpdfreader.com

Functions

Xpdf runs on nearly any Unix-like operating system. Binaries are also available for Windows. Xpdf can decode LZW and read encrypted PDFs. The official version obeys the DRM restrictions of PDF files,[7] which can prevent copying, printing, or converting some PDF files.[4] There are patches that make Xpdf ignore these DRM restrictions,[8] and these restrictions are patched out by the Debian distribution.[9]

Xpdf includes several programs that don't need an X Window System, including some that extract images from PDF files or convert PDF to PostScript or text. These programs run on DOS, Windows, Linux and Unix.[4]

Xpdf is also used as a back-end for other PDF readers frontends such as KPDF and GPDF,[6] and its engine, without the X11 display components, is used for PDF viewers including BePDF on BeOS, '!PDF' on RISC OS, on PalmPDF[10] on Palm OS[4] and on Windows Mobile.[11]

Two versions exist for AmigaOS. Xpdf needs a limited version of an X11 engine called Cygnix on the host system. AmigaOS 4 included AmiPDF, a PDF viewer based on 3.01 version of the Xpdf. However both Apdf and AmiPDF are native and need no X11.

xpdf-utils

The associated package "xpdf-utils" or "poppler-utils" contains tools such as pdftotext and pdfimages.

Exploit

A vulnerability in the Xpdf implementation of the JBIG2 file format, re-used in Apple's iOS phone operating software, was used by the Pegasus spyware to implement a zero-click attack on iPhones by constructing an emulated computer architecture inside a JBIG2 stream. Apple fixed this "FORCEDENTRY" vulnerability in iOS 14.8 in September 2021.[12]

See also

Notes and references
  1. "XpdfReader 4.03 release". 28 January 2021. Archived from the original on 13 May 2021.
  2. about on foolabs.com "Xpdf is licensed under the GNU General Public License (GPL), version 2. In my opinion, the GPL is a convoluted, confusing, ambiguous mess. But it's also pervasive, and I'm sick of arguing. And even if it is confusing, the basic idea is good. "
  3. xpdf xpdf 3.03 "The license was changed from GPLv2 to dual v2/v3 licensing."
  4. Xpdf website
  5. Glyph & Cog, LLC: Xpdf
  6. Polzer, Leslie (2006-11-28). "A survey of Linux PDF viewers". SourceForge, Inc. Retrieved 2007-08-30.
  7. Xpdf - Cracking
  8. Generic Xpdf Patch Instructions
  9. Okular, Debian, and copy restrictions
  10. PalmPDF
  11. PocketXpdf
  12. Beer, Ian; Groß, Samuel (2021-12-15). "Project Zero: A deep dive into an NSO zero-click iMessage exploit: Remote Code Execution". Google Project Zero. Retrieved 2021-12-16.{{cite web}}: CS1 maint: url-status (link)

Sources
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