This indicates an attack attempt to exploit a Memory Corruption Vulnerability in multiple Foxit products.
The vulnerability is due to an error when the vulnerable application converts a GIF file. A remote attacker may be able to exploit this to cause a denial of service condition on the affected system via a crafted file.
Foxit Reader 184.108.40.2066 and earlier
Foxit Enterprise Reader 220.127.116.116 and earlier
Foxit PhantomPDF 18.104.22.1686 and earlier
Denial of Service: Remote attackers can crash vulnerable systems.
Apply the most recent upgrade or patch from the vendor