So maybe this involves a WhatsApp 0day? If it's something that's been fixed since May 2018, then the malicious .enc file would either not work, or work normall

So maybe this involves a WhatsApp 0day? If it's something that's been fixed since May 2018, then the malicious .enc file would either not work, or work normally. One thinks that such possibilities could be explored in a suitable test environment.