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I'm looking for an attachment that happens to be a password-protected PDF file (you need to type the password to open it). Is there a way to search Gmail for such files?

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You can search for PDF attachments, certainly. But Gmail has no idea whether a PDF is password-protected or not.

Searching for

filename:pdf has:attachment 

should return all of your conversations with a PDF attachment.

If the sender mentioned that it was password-protected in the body of the message, this might be helpful:

filename:pdf has:attachment password
| improve this answer | |
  • @Vaddadi: Good point. I've adjusted my answer (and will adjust my filter). – ale Jul 29 '16 at 16:26

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