The file uses recursive layers of compression to hide an impossible amount of data: A tiny 42 KB zip file. Layer 1: Contains 16 zip files. Layer 2: Each of those 16 contains another 16, and so on.
Technically, it contains no malicious code. It is just data that is too big to handle.
If an antivirus program or a curious user tries to "unzip" the file: It will quickly fill any hard drive. Memory Crash: The system's RAM will be overwhelmed.
The bottom layer contains 4.5 petabytes (4,503,599,627,370,496 bytes) of data. ⚠️ Why It Is Dangerous
You generally have to trigger the extraction for it to do damage.