Upload the RAR file to VirusTotal to check for known signatures of malware.
If you were trying to create a similar archive, you can find guides on how to create RAR self-extracting archives or set up encrypted files with multiple passwords using standard archival software. Archive files with multiple encryption passwords - PeaZip Echozy.pw.rar
Avoid running any .exe or .bat files from this archive without verification. Upload the RAR file to VirusTotal to check
Usually contains a .exe file intended for installation. Echozy.pw.rar
If you are looking for what might be inside or how to handle it:
Verify the reputation of the site or person that provided the link to Echozy.pw .