It is part of the binary-to-text encoding used to include graphics or formatted documents within a plain text submission.
In the world of online forensic sleuthing, "M4C.7z" is a red herring. People often stumble upon it when viewing the "complete submission text file" of an SEC filing. M4C.7z
Searching for "M4C.7z" reveals a digital artifact frequently appearing in the raw text versions of SEC Edgar filings . While it looks like a 7-Zip compressed archive, it is actually a string of often found in large financial disclosures from institutions like JPMorgan Chase . The Mystery of M4C.7z It is part of the binary-to-text encoding used
It appears in thousands of documents, such as Form 424B2 or FWP filings. Searching for "M4C
You can find these strings in the raw .txt versions of major corporate filings: