Do you know that it is possible to create a ‘Zip Bomb’? This is a small zip file that contains multiple layers of compressed files. One could say he has malicious nature, since the final version of the non-compressed data may be much larger than compressed, so that when they are decompressed again, they can block a computer.
A researcher named David Fifield has managed to create perhaps the most dangerousZip Bomb, which has existed so far. It can unpack an 46MB file into 4,5 petabytes of data.