Why(e.g., suspicious behavior on your PC, part of a forensic investigation)
7z files can contain malicious scripts (like .vbs or .ps1) or executables that trigger upon extraction. caufu.7z
If the file asks for a password, it is likely encrypted, which prevents many security tools from scanning its contents before you open it. suspicious behavior on your PC
If you must investigate, only open the file inside a secure, isolated environment like Any.Run or a dedicated Virtual Machine. it is likely encrypted