Whitepaper discussing how to leverage the WhatsApp remote code execution vulnerability that takes advantage of a double free vulnerability in the DDGifSlurp function in decoding.c in the android-gif-drawable library.
You can download it from the following link: https://packetstormsecurity.com/files/download/158305/whatsapp-exec.pdf
Source: https://packetstormsecurity.com/files/158305/WhatsApp-Remote-Code-Execution.html