If you are simply looking for a review of the RAR compression format used for such packs:
: Generally better than ZIP but slightly less efficient than 7z for large data sets. CheckerPack.rar
: Before opening, upload the file to VirusTotal to check it against dozens of different antivirus engines. If you are simply looking for a review
Could you provide on where you found this file or what it's supposed to contain? Solid split RAR file checksum error · Issue #1910 - GitHub CheckerPack.rar
: "Checker Packs" are often bundles of tools used for credential stuffing or mass-checking leaked databases against specific websites. These tools are often flagged as "Riskware" or "Malware" because they are frequently "cracked" versions of paid software containing hidden backdoors. RAR File Performance