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    What mean not very dangerous? Still dangerous, but not very? Could this be dangerous or not? Please keep in mind: PDF is an extension of Postscript and Postscript is a complex programming language! So yes, if you don't trust emitter, stay care!! Commented Oct 12, 2024 at 8:58
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    File was opened in the desktop Outlook. So your points 1&2 don't apply. "encrypting malware often (but not always) makes it less dangerous" -- I think I know what you meant to say with that, but as written, it's demonstrably incorrect. Commented Oct 12, 2024 at 9:51
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    @schroeder My first point does apply, because as far as I’m aware, downloading a file and getting emailed a file are not even remotely similar. As for my second point, I don’t have any concrete evidence for this but it seems likely that in terms of file handling in this context, the outlook application and outlook webapp would behave similarly. And as for my third point, your comment: ”If it was actually a true PDF, then the password prompt would have to have been entered before anything in the PDF could be triggered” is exactly the point I made, just in slightly worse phrasing. Commented Oct 12, 2024 at 11:05
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    I am not arguing to be pedantic, I am arguing because I feel like you have unfairly written off my answer as something completely different to what it is… Commented Oct 12, 2024 at 11:05
  • @security_paranoid so let take the worst case scenario, and it was a malware that looks like a PDF with password dialog.. then what i can do now? my windows 11 is up to date and i have AVG anti-virus.. nothing raised any thing when i open the file and i did a full scan and nothing was mentioned Commented Oct 12, 2024 at 11:32