App Para Abrir Archivos

If this vulnerability is being exploited in the wild, what sort of web pages are being hacked to send these drive-by downloads to people? Is it websites like Microsoft, cnn, espn, abc, nbc, bbc, amazon, ebay? Or is it more like less known sites? Are certain web publishers more vulnerable to have the websites they host hacked? I think I am missing something, I just do not know what it is.