The vulnerability lies in Foxit Reader 10.1.3.37598 and earlier versions. The newest version of Foxit Reader, 10.1.4.37651 addressed these security issues and more. Anyone using Foxit Reader should ensure that they have their software up to date. As with any type of third-party software, whenever an update or security patch is released it is recommended that those are downloaded immediately.
More can be read here: https://www.bleepingcomputer.com/news/security/foxit-reader-bug-lets-attackers-run-malicious-code-via-pdfs/