title_body: Fonts malformed when extracted from epub files
upvoted_answer: There is a feature, font obfuscation, which prevents you from viewing/using any embedded font after  unzipping the epub. Whether this has happened in your case is unclear. However, if the epub was created in Indesign, that is likely to be the issue because Adobe Indesign obfuscates fonts when it creates epubs. 
  
  http://www.idpf.org/epub/20/spec/FontManglingSpec.html