Definitely worth a read...
Indexing pdf documents with Adobe Reader v.8 and MOSS 2007
The version 8 of the adobe reader has some significant architectural changes (for the better of course) including an inbuilt IFilter to index PDF documents. Previously the adobe IFilter was available as a seperate download. This new change in architecture compromised the ability to search pdf documents from within MOSS 2007. However, the pdf filter works fine with WDS 3.0 . While many consultants recommend that if we're to index pdf documents through MOSS 2007, we use the the v.6 of adobe IFilter and if we want to index pdf documents through WDS 3.0 or higher, we use the v.8 of adobe reader. But what if we wanted to index pdf documents using both WDS and MOSS 2007?!!! Here's how you can use MOSS 2007 with adobe reader v.8, the version currently patronized by WDS