ffs if you guys don't even know what the fuck cdn is or how file hosting works, maybe don't open your big mouths and accuse services of being compromised.
Look at the defender message that calls the file a virus. See the name of the supposed threat? See how it contains "!ml"? It means that the "virus" was classified as such by MACHINE LEARNING. Yes, the same AI retard brain that can't classify whether an image is of a cat or a fire hydrant. Code injection trips all sort of triggers, whether it's malicious or not, it's just how it is. If you want to be more certain, then just dump the suspicious file to something like virustotal, and see if any mainstream AV engine detects something NOT marked as "ml" or "ai". Unless it's some genius 300 IQ underwater reverse Settlers of Catan move by its creator, then the file is safe, but who are you kidding - NOBODY with actual blackhat hacker talent would waste it on creating a 0day exploit virus for a japanese porn game posted on an obscure website.