I installed the Adobe 9 IFilter on SharePoint 2010 Search server and it does not seem to do full-text searches of PDF files. I followed the Adobe artcile below exactly as indicated in the article below (just applied it to SharePoint 2010). I have rebuilt my index multiple times and have done full crawls since installing the filter. I have also restarted all servers in the farm. I do see the Adobe Icon fine in my searches and any metadata users have added are searchable.
Followed this document when I installed the filter: