Adobe Reader Xi Version 11.0.23 ((install))
Adobe Reader XI version 11.0.23 holds a unique place in software history as the "final curtain call" for the iconic XI series. Released on November 14, 2017
Installation and Setup
In 2019, the Crooked Scoreboard APT group targeted energy companies using PDFs crafted specifically to exploit unpatched Adobe Reader XI installations on industrial control system workstations. The malformed PDFs would crash 11.0.23 and install backdoors. Because the systems were air-gapped, operators assumed the old software was safe—they were wrong. adobe reader xi version 11.0.23