JS Downloader FHY [Trj]

Hello, so since today i get the message from my Avast when i log into my online banking mail box that this JS Downloader FHY [Trj] was found and blocked, is this may be a mistake from avast or has my Bank some problem, cause i read about that this can be a wrong detection of some sort sometimes.

Best Regards

See: https://forum.avast.com/index.php?topic=220533.msg1469382#msg1469382