Are PDF downloads safe?

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Tags

1. #really
2. #cannot
3. #entirely
4. #viewing
5. #proof
6. #features
7. #adobe
8. #printing
9. #protected
10. #means
11. #malware
12. #readers
13. #attacks
14. #against
15. #reader
16. #security
17. #files
18. #screen
19. #saving
20. #vulnerable