An issue was discovered in Adobe Acrobat Reader 2018.009.20050 and earlier versions, 2017.011.30070 and earlier versions, 2015.006.30394 and earlier versions. This vulnerability is a security bypass vulnerability that leads to a sandbox escape. Specifically, the vulnerability exists in the way a cross call is handled.
https://helpx.adobe.com/security/products/acrobat/apsb18-02.html