Wow, Adobe rethinks PDF security. Curious why? Because of vulnerabilities in Abobe Reader (and so zero-day exploits), of course. From the article:

From time to time we’re receiving questions regarding various technologies used in our products, especially Thunder Tables™ and GPU acceleration. Today I’d like to explain what exactly Thunder Tables™ is (and what it’s not).

From F-Secure advises against using Adobe Reader article: