'PoC||GTFO' issue no. 08 PDF document is a 'plain English'-to-'plain English' en- & de-crypting polyglot device too...

by pdfkungfoo 9 years ago featured

GNU/Linux ◆ xterm ◆ bash 6694 views

This ASCiinema screencast shows some aspects of the PDF file which is issue 08 of the International Reverse Engineering and Hacker Magazine (my label, not theirs!) – aspects which all can be explored from the command line.

Get surprised! – Or DID you know you can make a valid (in the sense: every major viewer opens it without any warning or error message) PDF document to double up as an executable program – one that encrypts all the English plain text snippets you feed it into other English plain text snippets (and back again).

(The cast may at certain spots be progressing too fast for you to follow closely. Please make use of the Pause button at the lower left corner if you need more time to read+understand the details of the screen contents. You can also scroll back if needed.)

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You can download this recording in asciicast v1 format, as a .json file.

Download

Replay in terminal

You can replay the downloaded recording in your terminal using the asciinema play command:

asciinema play 22364.json

If you don't have asciinema CLI installed then see installation instructions.

Use with stand-alone player on your website

Download asciinema player from the releases page (you only need .js and .css file), then use it like this:

<!DOCTYPE html>
<html>
<head>
  <link rel="stylesheet" type="text/css" href="asciinema-player.css" />
</head>
<body>
  <div id="player"></div>
  <script src="asciinema-player.min.js"></script>
  <script>
    AsciinemaPlayer.create(
      '/assets/22364.json',
      document.getElementById('player'),
      { cols: 95, rows: 35 }
    );
  </script>
</body>
</html>

See asciinema player quick-start guide for full usage instructions.

While this site doesn't provide GIF conversion at the moment, you can still do it yourself with the help of asciinema GIF generator utility - agg.

Once you have it installed, generate a GIF with the following command:

agg https://asciinema.org/a/22364 demo.gif

Or, if you already downloaded the recording file:

agg demo.cast demo.gif

Check agg --help for all available options. You can change font family and size, select color theme, adjust speed and more.

See agg manual for full usage instructions.