if you don't know the source. RAR files can contain executable malware or scripts that run upon extraction.
Some backup systems rename files into hexadecimal or numeric strings during the synchronization process to prevent unauthorized users from identifying the content via the name alone. Important Security Warning ZxZ14534620221129224311.rar
Do you have on where you found this file name or what you expected it to contain? if you don't know the source
Likely an internal ID or serial number assigned by a database. ZxZ14534620221129224311.rar
If you have encountered this file on your computer or a public download site: