to be inside (e.g., a game mod, a document)?

: If the extractor or a file inside asks for Administrator permission, deny it.

: Upload the file to VirusTotal to check it against 70+ antivirus engines.

: Ensure it is actually a .rar and not a double extension like .rar.exe .

: If you expected a video or document but find .exe , .scr , or .bat files inside. To help you more specifically, tell me: Where you found the file (e.g., email, specific website)?