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Scammers are so dumped to the extent they believe everyone is dump like them
I am scared that you made a bogus statement here.
Scammers are the smartest people I have known, just that they use their smartness on the negative path. Whatever is scam related, I always treat it with care.
Those guys are always on research about the latest technology and how to harness it against victims. Their attempts will only look dumb to you only if you are acquainted with that method already.
Using Op's case as the study;
- Do you know that by downloading the PDF, Op's device could be infected?
- Do you also know that by reading the mail, Op email is prone to more attack or spam because he would be marked as an active email (a potential victim)?
- Do you know that if Op gives a call to that number he could be sweet talked to being a victim?
Scammers are just proactive and crooked.