: A virus inside a RAR file generally cannot harm your device as long as it remains compressed. Opening or "extracting" the contents triggers the risk.
: If you received this file via an unsolicited email or found it on a shady download site, it is almost certainly a threat. Immediate Safety Steps
: You can upload the file (if it's small) to VirusTotal to see if multiple security engines flag it as malicious.
: If you weren't expecting a file named "MS05v," the safest action is to delete it immediately and empty your trash. How to Safely Handle RAR Files