This indicates an attack attempt to exploit an Out Of Bounds Write vulnerability in Adobe Acrobat and Reader.
The vulnerability is due to an error when the vulnerable software handles a maliciously crafted EMF file. A remote attacker may be able to exploit this to execute arbitrary code, via a crafted EMF file.
Adobe Acrobat DC Continuous for Windows and macOS 2018.011.20058
Adobe Acrobat Reader DC Continuous for Windows and macOS 2018.011.20058
Acrobat 2017 Classic 2017 for Windows and macOS 2017.011.30099
Acrobat Reader DC 2017 Classic 2017 for Windows and macOS 2017.011.30099
Acrobat DC Classic 2015 for Windows and macOS 2015.006.30448 and earlier versions
Acrobat Reader DC Classic 2015 for Windows and macOS 2015.006.30448 and earlier versions
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor.