Use a sandbox environment to observe its behavior safely if it contains executables.
Check for official security bulletins from providers like Wordfence if the file was found on a web server. 7z-tools/README.md at main - GitHub Bejing.7z
Upload the file to an online analysis tool like VirusTotal to check for known signatures. Use a sandbox environment to observe its behavior
: Standard 7z files can be used to hide or inject steganographic data between the packed body and the footer. Bejing.7z