“Malvertising” refers to the use of advertising networks to distribute malware, and it was a popular method of choice for attackers in 2014 to get their malicious code out there. The problem is that web site owners have little control over malvertisements because they’re places on legit pages by third party advertising delivery networks.
Read more about this latest worrisome threat:
http://www.darkreading.com/vulnerabilities—threats/the-truth-about-malvertising—/a/d-id/1318641?