: Because it is part 6, the archive's central directory (the list of what's inside) is usually stored in the first or last volume. Without those, this file is just a block of compressed data.
: If the source of this file is unknown, do not attempt to join and extract the archive . As noted above, this naming format is a standard for distributing live malware samples to security professionals.
: Repositories like VirusShare or Malshare often distribute large batches of malware samples in split RAR archives named by their hashes. If you found this in a research lab or a "VirusShare_XXXXX.zip" collection, it likely contains encrypted malicious samples for analysis.