The .7z (7-Zip) format is a common container for malware because it can hide executable scripts within what looks like a document archive.
: To read the book safely and support the author, follow the official releases on Dragonsteel or major retailers like Amazon or Audible. W&T.7z
: Often, these files contain a small .exe disguised with a PDF icon or a script that runs as soon as the archive is extracted. Recommendation W&T.7z