Adobe Acrobat and Reader versions 2019.010.20100 and earlier, 2019.010.20099 and earlier, 2017.011.30140 and earlier, 2017.011.30138 and earlier, 2015.006.30495 and earlier, and 2015.006.30493 and earlier have an use after free vulnerability. Successful exploitation could lead to arbitrary code execution.
https://www.zerodayinitiative.com/advisories/ZDI-19-496/
https://helpx.adobe.com/security/products/acrobat/apsb19-18.html