Greetings, I am afraid I have to re-open this again.
So, I have the same monit malware issue. I’ve deleted the theme and all related plugin + downloaded latest definition updates.
However, it seams the script is re-injection it self, even after Anti-Malware deletes it.
It seems to be bigger than what we think it is.
Screenshot:
https://ibb.co/wY0Sd57