Do not use Adobe, Foxit or other big software companies products. These two are targeted by virus writers as they are low hanging fruit: High amount of users, who are often inept at computers and common sense, bloated (easier to make mistakes and harder to debug), and often include backdoors on purpose (mandated by the government of the developers).
Instead, use free (libre) software which is lightweight, peer reviewed and thus safer.
It is a good idea to have a secondary computer (a second hand laptop will do just fine) running a paranoid GNU+Linux or BSD software setup and full disk encryption for "questionable" activities, while you keep your main rig or tablet strictly for vidya/jewwood/casual browsing.