I can help you figure out the next steps if you can tell me where you encountered it.
: Use a service like VirusTotal to check the file against dozens of antivirus engines without needing to open it. GrudgingPaddingPantyhoseCreatable.7z
: Open the file inside a virtual machine or a "sandbox" environment like Any.Run or Windows Sandbox . I can help you figure out the next
: Use a tool like ExifTool to see if there is any author or creation data attached to the archive. GrudgingPaddingPantyhoseCreatable.7z