If this is a specific file you are investigating or a challenge you are working on, it is likely part of a private competition, a very recent release, or a niche malware sample.
If you can provide a or a description of the files inside , I can give you a much more detailed breakdown. QSX.rar
Use exiftool or strings to look for hidden comments or creator info. If this is a specific file you are
Check if the RAR is encrypted or uses "header encryption" (which hides the filenames until the password is entered). a very recent release
(e.g., a specific CTF platform, a suspicious email, or a GitHub repo).