Do not extract the contents. Compressed archives like .rar or .zip are often used to hide viruses or malware from basic scanners.
“You can try uploading the RAR file to virustotal.com and check the results.” Purism community · 5 years ago
Malicious files sometimes use names like 56579.rar.exe to trick users into running an executable while thinking they are just opening a folder. 56579.rar
If you have already downloaded the file, do not open it. Instead, upload it to the VirusTotal scanner to see if it triggers any security flags from major antivirus engines.
Are Zip Files Safe to Open?
Hackers frequently use RAR files to deliver "backdoor" programs or steal sensitive data once the user runs an enclosed file. Community Perspectives
Because "56579.rar" does not correspond to a recognized program, treat it with extreme caution: Do not extract the contents
Legitimately used for data compression and splitting large files into smaller parts.