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To the short list of things I find lacking in Comix, PDF Support is the most important. I hope this is implemented as I now have to fire up Evince to read stuff. Thanks in advance!
The problem with PDF reading is that there is no clean way to read PDFs using Python/PyGTK. There are Python bindings for Poppler, but they are not official and probably not standard software on most systems.
worst case scenario, you could shell out to something like imagemagick (or the netpbm tools) to convert the pdf to png/jpg files, then zip them up into an already-readable format.
There is a tool called pdfimages bundled with Poppler (or xpdf) that can extract all images in a PDF file. Some years ago I actually did hook it up to Comix to have it read PDFs (only the images of course), but it was rather slow. I tried pdfimages again now and it seems a lot faster now than I remember it to be. The command-line interface it offers doesn't really fit into Comix' archive handling though (a PDF will be treated like an archive basically), but with some hacks it could be made to work.
Would this work? https://launchpad.net/poppler-python