If you found this file on a suspicious website or received it in an unsolicited email, Check the source: Did you expect this file?
To avoid being indexed by search engines (like Google), the service assigns a non-descriptive name.
.rar files can contain executable scripts ( .exe , .bat , .vbs ) that run as soon as you "Install" or "Extract" them.
Use a service like VirusTotal to check the hash before extracting.