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I don't see anything "another" about this; this problem is well known by $((CURRENTYEAR-10)) or so.

• sp0rk 1y ago
  The author explains in the article that they previously gave a presentation outlining various techniques to achieve a "schizophrenic" zip file. The blog post discusses an additional technique that was not present in their previous presentation.
• amelius 1y ago
  Ok, so how do you handle them? Do you take screenshots of your PDFs before you forward them? Other ideas?
  • dbdr 1y ago
    You can forward the PDF itself, not the zip file.
    • amelius 1y ago
      I don't know much about the subject but I do know that PDF is an executable format, and I suppose it could use fingerprinting (based on e.g. screen size or resolution) to become schizophrenic (?)
• gynvael 1y ago
  Author here :) Are you saying that parser discrepancy is a well known problem OR that this exact technical issue described (CD offset vs CD size used to derive CD location) is a well known problem? If the prior, you are of course right — parser discrepancy and the existence of these kinds of "multiple personality" files isn't a new thing. I'm pretty sure this can be traced back to at least the '80 :) However, if you mean the latter, I would appreciate a link if you can recall where you've seen it before / read about it — I can then add it to the article.