When i seen a PDF as attachment in my notifications, i was pretty sure its a telegram scam account ; i couldnt believe its on the stake official account ; and even when i seen its official, i didnt downloaded / clicked on it , PDF its a BIG NO these days to download and run.
Stake should take another approach next time
I am kind of lost bud, what pdf are you talking about exactly? I did get a private message from one of the Stake's official campaign manager a few days ago about claiming some kind of bonus, and it the message, there was a downloadable file, though the file was not pdf, it was an exe extension file, I did download it but thankfully, my system's windows defender program was fully active, and strong enough to detect that the file was a virus, which it automatically deleted.
And this was good because the stake campaign manager did later announce that his telegram was hacked.
So, if that is what you are talking about, then it's not a pdf file but an exe file, and it was a virus.