Modern malware families (like Dridex or Emotet in their early forms) used double extensions to trick users. An .avi.epub could actually be a script or .js file. Once opened (if associated with a vulnerable EPUB reader), it could:
. In peer-to-peer (P2P) file sharing or torrenting, files are often renamed with popular keywords to trick users into downloading them. An file claiming to be an video is likely either: A Virus/Malware:
The file extension .avi.epub is highly unusual and suggests a potential technical issue or a security risk: : A common video container format. .epub : A digital book/e-book format.
that does not contain the actual video content. Users should exercise extreme caution and avoid opening files with mismatched or double extensions. Brasileirinhas - Carnaval 2006 - Vivi Fernandes.27 24 Dec 2018 —
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The keyword itself—ending in both .avi and .epub —is a quirk of the early internet. This usually happened for one of three reasons: