It embeds the executable file or payload inside the jpg file. The method the program uses isn't exactly called one of the steganography methods. For this reason, it does not cause any distortion in the JPG file. The JPG file size and payload do not have to be proportional.The JPG file is displayed normally in any viewing application or web application. It can bypass various security programs such as firewall, antivirus. If the file is examined in detail, it is easier to detect than steganography methods. However, since the payload in the JPG file is encrypted, it cannot be easily decrypted. It also uses the "garbage code insertion/dead-code insertion" method to prevent the payload from being caught by the antivirus at runtime.
Why do you think that https://github.com/berylliumsec/nebula is a good alternative to JPGtoMalware