Hello XVilka!
XVilka Haos of System writes:
> Hello!
> If you heard about PoC||GTFO e-zine, you know that they're playing
> with produced PDF format a lot, keeping it still a valid. Since
> zathura based on poppler, I've checked also those files with evince.
> Seems evince parse them properly.
>
> Take e.g. this file https://www.alchemistowl.org/pocorgtfo/pocorgtfo11.pdf
> Zathura show nothing, evince show all pages properly.
>
> You also can check on other files from this page too:
> https://www.alchemistowl.org/pocorgtfo/
The problem doesn't seem the PDF plugin used (I can reproduce the same
with zathura-pdf-mupdf) but the fact that zathura uses libmagic(3) (or
similar methods) to invoke the proper plugin, e.g.:
$ zathura pocorgtfo11.pdf
error: Unknown file type: 'application/octet-stream'
...indeed:
$ file --mime-type pocorgtfo11.pdf
pocorgtfo11.pdf: application/octet-stream
Giving a look to the first 112 bytes of it we can see:
$ hexdump -C -n 112 pocorgtfo11.pdf
00000000 72 65 71 75 69 72 65 20 27 6a 73 6f 6e 27 0a 72 |require 'json'.r|
00000010 65 71 75 69 72 65 20 27 73 6f 63 6b 65 74 27 0a |equire 'socket'.|
00000020 72 65 71 75 69 72 65 20 27 75 72 69 27 0a 3d 62 |require 'uri'.=b|
00000030 65 67 69 6e 0a 25 50 44 46 2d 31 2e 35 0a 25 d0 |egin.%PDF-1.5.%.|
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^
...PDF starts here!..............
00000040 d4 c5 d8 0a 39 39 39 39 20 30 20 6f 62 6a 0a 3c |....9999 0 obj.<|
00000050 3c 0a 2f 4c 65 6e 67 74 68 20 31 30 39 34 34 0a |<./Length 10944.|
00000060 3e 3e 0a 73 74 72 65 61 6d 0a 3d 65 6e 64 0a 70 |>>.stream.=end.p|
00000070
Getting rid of the first 53 bytes:
$ tail -c $(expr $(wc -c < pocorgtfo11.pdf) - 53) pocorgtfo11.pdf >
pocorgtfo11-pdf.pdf
$ file --mime-type pocorgtfo11-pdf.pdf
pocorgtfo11-pdf.pdf: application/pdf
...we can correctly view it:
$ zathura pocorgtfo11-pdf.pdf
I'm not sure if maybe an option to force a particular plugin (and
avoid using libmagic(3) and any similar methods) can be useful or
not. In these cases it is!
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