Before interacting with the file, upload it to VirusTotal to check it against over 70 different antivirus engines.
Avoid decompressing the archive. If it contains a script (e.g., .js , .vbs ) or an executable (e.g., .exe , .scr ), simply opening the folder or extracting it could trigger a "hidden extension" trick where a file named document.pdf.exe appears only as a PDF.
Some automated enterprise systems or database export tools generate alphanumeric strings for temporary backup files.