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Date: Tue, 23 Feb 2016 08:25:39 +0100
From: Dhiru Kholia <>
Subject: Re: current suggested/supported method for extracting
 hash from PDF files?

On Mon, Feb 22, 2016 at 10:12 PM, Jerry Kemp <> wrote:
> I have a password protected PDF file that I no longer have/remember the
> password to, and this should be an ideal opportunity to learn another aspect
> of John.
> If it matters, I'm using john 1.8.0 Jumbo-1 on Solaris.
> Reviewing my email archives, plus current documentation, I see at least 3
> possible options.
> Back in August 2012, it looks like we were using npdf2john , but this
> appears that it is no longer available on github
> Get npdf2john (from and
> run it on PDF file(s).
> From the /doc directory in 1.8.0 Jumbo-1, it is suggested to use pdfcrack as
> a PDF file cracker.
> From the /run directory, It looks like I have available
> Are there others?
> Wondering what the current preferred/suggested method of cracking PDF's is?

I just added this help file to the repository.

Additionally, I recommend using the latest code from our GitHub repository,


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