I'm trying to crawl LiveCycle PDFs using SharePoint 2010 or FAST for SharePoint 2010 and have not been able to extract any document content using the Adobe iFilter (have tried versions 9 and 11). The only text that comes through is:
To view the full contents of this document, you need a later version of the PDF viewer. You can upgrade to the latest version of Adobe Reader from www.adobe.com/products/acrobat/readstep2.html For further support, go to www.adobe.com/support/products/acrreader.html
Text from regular PDFs is indexed with no problems.