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 an instance of a use after free vulnerability in the XFA engine, related to DOM manipulation. The vulnerability is triggered by crafted XFA script definitions in a PDF file. Successful exploitation could lead to arbitrary code execution.
https://www.zerodayinitiative.com/advisories/ZDI-18-176/
https://helpx.adobe.com/security/products/acrobat/apsb18-02.html