Virus in PDF, is it possible?

Question

Malware

A letter came to the post office, I opened it through the phone in the application.
There was a picture and it seemed to have a link in it, either to a video, or to something else.
Is it possible to infect the phone, I heard that there are such viruses

Answer 1

There are vulnerabilities in the format itself.
Such that directly infected the phone, but in the spam mailing list - very unlikely.
Smartphones still do not have a greater danger than the user himself, who allows the left programs everything in a row.

Answer 2

Haha, I once coded an offline application system inside pdf (a set of services, all sorts of buttons, checkboxes), you write JS scripts there.