You can easily get around any anti-virus without a problem, so all these people saying these ridiculous statements that they don't even use an anti-virus, I feel sorry for all you. Can almost guarantee if you download online, you are infected with some sort of malware. Probably a RAT.
Oh and to the linux chronies, you may not be aware of the rootkit embedded in a certain distribution last year.
People could almost say that Linux was virus-free until about 10 years ago, when people started scoping out - there's plenty of exploits in linux and you are also dumb to think your safe.
Best tips are to use a good av, run malwarebytes every month aswel as another of your choice (I use spybot and ccleaner), use a good startup and process explorer and only run downloaded executables in a virtual machine (unless from trusted vendors). Sandboxie and the like will not work as there are methods to trick these apps into thinking the exe is safe.
Don't trust when people say false positive as most of the time I assure you they aren't (I'm not saying there is no such thing as a fp but be very wary).
Just a heads up, you don't need to take notice