MalwareHunterTeam found numerous sites distributing a fake PDF editing program called ‘PDFreader’ Trojan steals Facebook session cookies and sensitive data from the Facebook Ads Manager. Trojan shares characteristics with other Trojans, such as AdKoob and Stresspaint, that also attempt to extract and steal Facebook data from various URLs. Trojan will first attempt to steal Facebook sessions cookies from Chrome and Firefox by accessing the Cookies SQLite database. It will then connect a variety of Facebook URLs where information is extracted. Trojan may be inspired rather than evolved from previous infections.
Source: https://www.bleepingcomputer.com/news/security/facebook-ads-manager-targeted-by-new-info-stealing-trojan/