Please note that these free tools are provided as-is and without warranty of any kind. The tools may only work with specific ransomware versions, and may not work with versions that were released after a tool was created. Technical support for the tools is available only to customers using a paid Emsisoft product.
PewCrypt is a ransomware written in Java that uses AES and RSA to encrypt a victim's files, adding the extension ".PewCrypt". The malware then asks the victim to subscribe to PewDiePie.
The author supposedly released this as a "joke" in 2019 - but be assured, ransomware is no joke, ever.
To use the decrypter, you will require the "AES.key" file left on the desktop by the malware.