How PDF Viruses Work?
How to Protect your Computer from PDF Viruses
1) Open up Adobe Reader
2) Go to Edit -> Preferences or simply press CTRL + K
5) Finally press Ok to apply settings.
Now whenever you open a new PDF file you don't have to worry about being hacked through documents and you will be safe from those types of attacks.
Note: You can also you an Online PDF Scanner to analyze any document, see it here: How to Scan Viruses Online for Free