The .7z.004 extension is universally used by the 7-Zip compression utility to denote the 4th volume of a larger, split archive.
The string most likely refers to a (part 4 of a compressed 7-Zip file) or a highly specific, private file naming convention. Cck 7z 004
A user took a massive folder (perhaps named "Cck") and split it into smaller, manageable chunks to fit upload limits or physical storage. Cck 7z 004
While you gather more details, here are the two most likely explanations for this exact string: 1. A Split 7-Zip Compressed Archive Cck 7z 004
Was this found as a on a storage drive or downloaded from the web?