false positive on js file on affiliate website

We’re getting what appears to be a false positive on a js file on our affiliate website.

The URL is
http://www.aoa.org/assets/prebuilt/js/modernizr.custom.17475.js

Avast Endpoint kicks a warning/block for Malware-Gen [Trj], but not every times. I’ve seen it 4 times out of 20 visits in my testing.

Scanning clean in virustotal. Manually downloaded the file and scanned it, avast reports clean.

Hello,

can you please provide us the sample from the virus chest? Unfortunately I am unable to reproduce this problem on my PC