On October 10th, researchers at the Chinese firm Qihoo 360 published an article warning of a zero-day exploit (CVE-2017-11826) affecting Office and which was already actively being exploited by attackers.
In the last few hours, we have detected a spam campaign targeting companies and making use of this exploit. This is a very dangerous attack since commands can be executed in Word with no OLE objects or macros needed. All our clients are proactively protected and updating will not be necessary thanks to Adaptive Defense 360.
Source: Panda Security