Adobe PDF iFilter is designed for end users or administrators who want to index Adobe PDF documents using Microsoft indexing clients. This filter allows you to easily search for text within Adobe PDF documents.
Adobe currently bundles a 32-bit PDF iFilter with Adobe Acrobat as well as free Adobe Reader software (in the case of Reader X, from 10.1 onward). It uses the Microsoft iFilter interface and allows third-party indexing tools to extract text from Adobe PDF files.
For 64-bit systems, no 64-bit iFilter is bundled with Acrobat or Reader. To enable iFilter indexing services on 64-bit system, Adobe has released Adobe PDF iFilter 9 for 64-bit platforms. It is available at the following URL: http://www.adobe.com/support/downloads/detail.jsp?ftpID=4025