I think it is part of cloudflare's browser insights which is now part of their "...

I think it is part of cloudflare's browser insights which is now part of their "Web Analytics". You will see this almost with any site using cloudflare that has web analytics enabled.

https://community.cloudflare.com/t/beacon-min-js-as-malware/...

https://developers.cloudflare.com/analytics/web-analytics/

The site owner needs to configure cloudflare correctly to add analytics on certain pages only otherwise cloudflare injects it by default.