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Password recovery fails using word list

2011-11-19
2018-06-16
  • Neeraj Jakhar

    Neeraj Jakhar - 2011-11-19

    Hi,

    I have a PDF. I know its password is composed of 8 characters. First four
    letters are known (as they belong to my name). The last four are digits. So I
    created this word list with a combination of all of them. For example, if
    letters were ABCD, my word list would be:

    ABCD0000
    ABCD0001
    ABCD0002
    ...
    ABCD0493
    ...
    ABCD1342
    ....
    ABCD9999

    Above ... represents all combinations in between.

    Yet the pdf crack is not working. When I execute the command, it returns
    almost immediately, and the following output is produced:

    $ pdfcrack -f mypdf.pdf -n 8 -m 8 -w wordfile
    PDF version 1.4
    Security Handler: Standard
    V: 2
    R: 3
    P: -60
    Length: 128
    Encrypted Metadata: True
    FileID: ca9d311fb8006bc442214d519b8daefa
    U: 4bc43001eb8fd07ccf67af5e1b42f19a00000000000000000000000000000000
    O: 998bb7d239db57bcbe395060f5eca43177b9a3acde5305999cf6e902fb7f9d45
    Could not find password

    What could be the reason?

    I am positive about the four letters (as they are four initial uppercase
    letters from my name). and for the numeric part I am taking all combinations
    anyway.

     
    • J SJ

      J SJ - 2018-06-03

      I have the same problem. There is not much instructions for this.

       
  • bulkomorowski

    bulkomorowski - 2016-11-27

    checki if this is a user or owner password

     
    • J SJ

      J SJ - 2018-06-16

      it's user password, there are sites that can crack owner passwords online. anyway, I tried both -o and -u. same result.

       

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