This indicates an attack attempt to exploit a Type Confusion Vulnerability in Foxit Software PhantomPDF.
The vulnerability is due to an error when the vulnerable software attempts to handles a maliciously crafted PDF file. An attacker can exploit this by tricking a user into visiting a malicious PDF file and execute arbitrary code within the context of the application.
Foxit Software Foxit Reader 220.127.116.119 and earlier
Foxit Software PhantomPDF 18.104.22.1689 and earlier
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor: