No Anti Virus?click here
Maybe it's just a pop up, like you have on Internet Explorer.
HEURISTIC VIRUS ALERT is virus like activity, so if you have no AV then i dont see how it can pop up, without using AV.
So it must be a simple pop up.
OnePlus 5 review
See the work of famous artists playing with toys
iPad Pro 10.5in (2017) review
Comment faire une capture d’écran sur un Mac ?