Use WinRAR or 7-Zip to extract. If it asks for a password, look for hints in the file's name or metadata. Brute Force
Before attempting to open any unknown .rar file, especially one with a cryptic name, assume it could contain malware. H4ll0w3n.rar
If this is a puzzle, the "meat" of the challenge often begins before you even extract the contents. File Signatures Use WinRAR or 7-Zip to extract
Run a strings command to find hidden text, URLs, or hints embedded in the file's binary data. Unrar/WinRAR especially one with a cryptic name
: Upload the file to tools like VirusTotal to check it against multiple antivirus engines.