Bizarre Adobe updater fake; any news?

Is anybody else getting this extra tab opening up in your browser that masquerades as an Adobe Flash Updater? It happened on both my wife's PC and mine almost immediately after updating our browsers, but then that could be coincidence. It's fairly sinister in that it opens in the form of an extra tab, implying either that the user had navigated to the site previously (did not, of course) or Adobe took the initiative because the user already has Adobe Flash on their systems. (except that it is not Adobe taking such initiative) The download is stuffed to the absolute limit with ruthless adware, and my wife went through a nightmare getting the offending software removed. Q: isn't this already wildly illegal? How has it succeeded in opening itself as a tab? Are there any articles about this rogue venture I can read up on? Thx.