title_body: Scan epub and pdf to ascertain absence of malware
upvoted_answer: epub have an html format, is possible to insert malware inside. Any antivirus can check your ebooks and report you if some is infected. 
  By other side, if you bought it from a marketplace as Amazon, probably your ebook is virus free. 
  If you download it from "other sites"… well, you must assume that "can" be infected, so use any online antivirus to check your files