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While I came to this site from researching whether inactive (or flattened) PDF documents could contain viruses and have come across this link in this site, it does not answer my question.

I need to devise a strategy to flatten PDF documents to prevent active fields to inflict any harm. So, could a flattened PDF document still contain viruses and would these viruses become active when the document is opened?

gtludwig
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    Actually, the answers do also answer this question. If the PDF reader has a *vulnerability*, then it doesn't matter if the PDF is flattened or has active fields or not. – schroeder Jan 14 '20 at 09:52
  • So, the best strategy would be, regardless of whether the document is flattened or has active fields, make sure it goes through an anti-virus, correct? – gtludwig Jan 14 '20 at 10:10
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    Well, the whole collection of protections, depending on the threat: AV, sandboxing, patching the PDF reader. There are tools that will re-write the PDF to only include the text content that *should* also remove any malware code in the PDF, too. – schroeder Jan 14 '20 at 10:16

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