was a pivotal security and maintenance update for the ubiquitous PDF viewer, released on June 29, 2010 . While it may seem like a relic today, this version represented a major turning point in how Adobe managed software security and automated updates during a period of high vulnerability for web-connected applications. The Context of the 9.3.3 Release

It introduced better safeguards against "social engineering" attacks that misused the PDF specification's ability to launch external files.

For users on Windows Vista and Windows 7, version 9.3.3 improved Windows Error Reporting (WER) , making it easier for Adobe to diagnose and fix future crashes.