It uses nested sets of archives (5 layers deep, with 16 files per layer) to overwhelm a computer's RAM and disk space.
A tiny 42-kilobyte file that, when unzipped, expands to a staggering 4.5 petabytes of data.
If you are working with IBM Mainframes and seeing this code during a .zip file transfer, it typically means the connection dropped before the file was fully written. 2. The "42.zip" Bomb