https://www.theregister.co.uk/2019/02/21/adobe_reader_acrobat_flash/

Adobe is taking a second crack at patching security bugs in its Acrobat and Reader PDF apps.

The APSB19-13 release, out today, attempts to completely kill off vulnerability CVE-2019-7089, which a software update earlier this month tried to address but was found to have insufficiently covered the security hole. In other words, Adobe's earlier update didn't fully fix the issue, and so now people have to update and patch their Acrobat and Reader installations again.