Thanks http://support.microsoft.com/kb/2293357

1. Install PDF iFilter 9.0 (64 bit) from http://www.adobe.com/support/downloads/detail.jsp?ftpID=4025 (http://www.adobe.com/support/downloads/detail.jsp?ftpID=4025)
2. Download PDF icon picture from Adobe web site http://www.adobe.com/misc/linking.html (http://www.adobe.com/misc/linking.html) and copied at C:Program FilesCommon FilesMicrosoft SharedWeb Server Extensions14TEMPLATEIMAGES
3. Add the following entry in docIcon.xml file, which can be found at: C:Program FilesCommon FilesMicrosoft SharedWeb Server Extensions14TEMPLATEXML
   <Mapping Key=”pdf” Value=”pdf16.gif” />
4. Add pdf file type on the File Type page under Search Service Application
5. Open regedit
6. Navigate to the following location:
   HKEY_LOCAL_MACHINESOFTWAREMicrosoftOffice Server14.0SearchSetupContentIndexCommonFiltersExtension
7. Right-click > Click New > Key to create a new key for .pdf
8. Add the following GUID in the default value
   {E8978DA6-047F-4E3D-9C78-CDBE46041603}
9. • Name: Extension
     Type: REG_SZ
     Data: pdf
   • Name: FileTypeBucket
     Type: REG_DWORD
     Data: 0×00000001 (1)
   • Name: MimeTypes
     Type: REG_SZ
     Data: application/pdf

• Restart the SharePoint Server Search 14
• Reboot the SharePoint servers in Farm
• Create a Test site (with any out-of-box site template) and create a document library upload any sample PDF document(s).
• Perform FULL Crawl to get search result.

**FAST Search Info**

By default fast search will index inside of pdf’s, however this would may be necessary to edit/ add this if using a third party IFliter.

Edit this file :

C:FASTSearchetcconfig_dataDocumentProcessorformatdetectoruser_converter_rules.xml

Add this :

<ConverterRules>
<IFilter>
<trust>
<ext name=”.pdf” mimetype=”application/pdf” />
</trust>
</IFilter>
<MimeMapping>
<mime type=”application/pdf”>PDF File</mime>
</MimeMapping>
</ConverterRules>

Run psctrl reset to reset all currently running item processors in the system.