"first they ignore you, then they threaten to sue you, then they deny the vulnerability, then you p0wn them" -- with apologies to Mahatma Gandhi 
archimede:~$ file pocorgtfo03.pdf 
pocorgtfo03.pdf: JPEG image data, JFIF standard 1.01, comment: ""

and 

archimede:~$ unzip -v pocorgtfo03.pdf 
Archive:  pocorgtfo03.pdf
warning [pocorgtfo03.pdf]:  12224072 extra bytes at beginning or within zipfile
  (attempting to process anyway)
 Length   Method    Size  Ratio   Date   Time   CRC-32    Name
--------  ------  ------- -----   ----   ----   ------    ----
    2561  Defl:X     1266  51%  02-10-14 06:23  1cd771a3  alexander.txt
    7848  Defl:X     2438  69%  02-08-14 20:20  8a6a8638  bochs-2.6.2.patch
    6135  Defl:X     2213  64%  02-08-14 20:21  29c418e5  bochs-20140203.patch
    7248  Defl:X     6970   4%  02-09-14 08:35  004f8d8a  defusing.zip
    4830  Defl:X     2510  48%  12-01-13 15:48  de2558ee  despair.txt
   14892  Defl:X     5919  60%  11-27-13 19:03  c0544467  lasta.txt
   26325  Defl:X    10767  59%  02-07-14 21:06  fdc977f0  lastq.txt
  473449  Defl:X   473001   0%  02-07-14 21:06  54e11d4c  netwatch-337f8b1.tar.gz
  131930  Defl:X   127770   3%  02-24-14 20:32  0de4adf4  nokiacipher.png
   14645  Defl:X     8926  39%  02-17-14 18:52  35c18990  packed
    2129  Defl:X      989  54%  02-07-14 21:06  02b0f193  saucers.txt
    3144  Defl:X     1399  56%  02-07-14 21:06  536812c9  tamadec.txt
    6227  Stored     6227   0%  02-07-14 21:06  091d21e7  tetranglix.tar.bz2
14109425  Defl:X 13873772   2%  02-07-14 21:06  5215c937  pocorgtfo02.pdf
     322  Defl:X      234  27%  03-03-14 01:28  050a8bf4  pocorgtfo03-encrypt.py
--------          -------  ---                            -------
14811110         14524401   2%                            15 files

I draw your attention to the fact that 0x02 being included in 0x03 is not an accident, why don't you have a look at the spoiler for 0x02 once you are done with 0x03?

But there is more...

Twitter: @travisgoodspeed: Scan the barcode on page 31 or type the bytes on page 32 to get a working Tetris game as an X86 Master Boot Record.

and

Twitter: @angealbertini: PoC||GTFO 0x03 is my latest polyglot: a PDF/ZIP/JPG/Audio (raw AFSK)/PNG (encrypted with AES) file.

with the accompanying image:

Image by Ange Albertini depicting the PoC||GTFO 0x03 polyglot.

closing remark: 

>trid.exe pocorgtfo03.pdf

TrID/32 - File Identifier v2.10 - (C) 2003-11 By M.Pontello
Definitions found:  5279
Analyzing...

Collecting data from file: pocorgtfo03.pdf
 71.4% (.MP3) MP3 audio (ID3 v1.x tag) (2500/1/1)
 28.5% (.MP3) MP3 audio (1000/1)

If the above looks amazing, and in it is in many ways, then you should read the other work by Ange Albertini, mix and his binary polyglots.