Crack pdf password with pdfcrack

December 13, 2007 at 21:34 · Tags: Debian, Fedora, Linux, Open Source, Open Standards, security, Ubuntu

PDFCrack is a GNU/Linux application (or any other POSIX-compatible system) tool for recovering passwords and content from PDF-files. It is small, command line driven without external dependencies. PDFCrack is released under GPL.

Install and pdfcrack on Ubuntu by typing:
cc@zeus:~$ sudo aptitude install pdfcrack

Run a quick cracking power benchmark:
cc@zeus:~/Desktop$ pdfcrack -b Benchmark: Average Speed (calls / second): MD5: 1728972.6 MD5_50 (fast): 97879.3 MD5_50 (slow): 69167.0


RC4 (40, static):       606555.3

RC4 (40, no check):     598050.0

RC4 (128, no check):    590141.7


Benchmark:      Average Speed (passwords / second):

PDF (40, user):         453510.2

PDF (40, owner):        220250.0

PDF (40, owner, fast):  499995.0

PDF (128, user): 22000.0 PDF (128, owner): 10408.7 PDF (128, owner, fast): 22220.0 cc@zeus:~/Desktop$

Use the pdfcrack to crack an encrypted pdf-file by typing:
cc@zeus:~/Desktop$ pdfcrack test.pdf

Happy pdf-hacking and cracking

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12 Comments »

Hacking » Blog Archive » Crack pdf password with pdfcrack said,

December 14, 2007 @ 0:38

[...] Read the rest of this great post here [...]
PDF Hacker said,

December 16, 2007 @ 14:54

Hello,

This piece of software just works very well. I managed to crack a huge number of password secured adobe pdf files with confident information
Smith said,

August 8, 2008 @ 2:24

Thx for sharing this GNU/Linux application. I currently use PDF Password Cracker Pro on Vista. It also works fine.
stell said,

August 20, 2008 @ 8:55

it is great … no problem whit pdfcrack -w xxx.txt bbb.pdf (list of password)
excep the interpr… of pdfcrack -c “a,as,d,df,etc” how?
you know this… use (pdfcrack option “c”)

plis anywere help
Henning said,

August 31, 2008 @ 16:31

First a recommendation that you should probably grab the upstream version of pdfcrack instead of the one in debian/ubuntu, unless they have updated to version 0.10 in the repos yet. This is because there are some nasty bugs in versions before that.

stell: the c-argument to pdfcrack is the charset and it takes a string of characters which is used for creating the passwords to test.
This string should should not use any separators and you need to escape characters which the shell might “eat” to get them picked up by pdfcrack.
Think of it as the alphabet which you provide, there is no point in having the same symbol twice in there and pdfcrack do not understand groups of symbols so the -c argument should only be a long string of unique symbols.

so, some examples:

# try to bruteforce with only numbers on test.pdf
pdfcrack -c 0123456789 test.pdf

# try to bruteforce with only small letters in English alphabet
pdfcrack -c abcdefghijklmnopqrstuvwxyz test.pdf

# try to brutefoce with the characters a, b, c, ‘, \ and space
pdfcrack -c abc\ \”\\ test.pdf

Good luck!

/Henning
recover my files 2 28 crack said,

October 8, 2008 @ 20:01

[...] using PDFCrack, which is a tool for recovering passwords and content from PDF-files. Small and fast.http://mediakey.dk/~cc/crack-pdf-password-with-pdfcrack/Summer Box Office 2008: Kung Fu Critics – Cinema BlendBy Josh Tyler: 2008-08-28 04:15:22 When he [...]
Claus said,

February 1, 2009 @ 20:47

Hello,

I’m currently searching for faster techniques for pdf password and encryption hacking and cracking.

Please leave a comment if you know other cracking techniques.
psst said,

June 13, 2009 @ 17:55

How bad cpying not linking
http://packratstudios.com/index.php/2008/04/09/how-to-crack-recover-an-adobe-pdf-password-using-pdfcrack-for-linux/
Wilco said,

June 22, 2009 @ 2:36

It does not work with fileopen plug-in
Steven Li said,

August 12, 2009 @ 6:01

I have compiled windows version, and ghacks also introduced it ,

http://soft.rubypdf.com/softwares/pdfcrack
kozero said,

November 13, 2009 @ 16:58

PDF Password Recovery 5.0 can remove restrictions on copying, printing and other actions for PDF

files in just seconds!
http://www.recoverlostpassword.com/products/pdfpasswordrecovery.html
Emiliano said,

April 17, 2010 @ 14:39

Hi there! Could anybody provide a description of the function Output? I actually can’t understand what the fields
Length:
FileID:
O:
U:
mean.
Thanks a lot.

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