I use so much Ad Blocking that I dont know if this is true or not.
uMatrix (to have control over what shit a Site can load)
Adblock Plus (to blacklist certain web elements)
Pi-Hole (to blacklist Ad Domains)
Firefox (though that doesn’t prevent most Ads ofcourse, though it works against tracking)
and Linux in general (since clearly that cant get a Virus)
Though considering it is a Website dedicated to hosting PDFs, why the fuck aren’t you just posting a normal Link to your PDF @Erik3003 ?