How to know a PDF file is edited/modified

I got a PDF file from a unknown source by email and want to check whether the file got modified by someone to change its content, before it send it to me?

That depends on what it is you are looking for.
In File>Properties>Description you can see the creation date and the date that it was last modified.
What is it exactly you need to know? For the most part, unless it has a digital signature from the originator of the file (or at least the last person that had it legitimately), you can't be sure.

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