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.

Here is what I’ve found works for WSS 3.0:

1. First, you need to download the Adobe PDF IFilter 6.0, which you can find at this URL.  You should also get hold of a suitable Icon to use with PDFs, so that when they are listed in a document library they are easily recognisable.  There is a 17 x 17 one available on the Adobe web site here.
2. Once you’ve downloaded the IFilter, install it on your WSS 3.0 server, and then follow the instructions on registry settings in Microsoft KB Article 927675.  I’ve always found that providing the Adobe IFilter installed properly, the only setting I need to add is the Search Extensions one listed in step 2.  Also note step 5 re stopping and re-starting the search service.
3. Now you need to set up the Icon file.  If you downloaded the icon file in step 1 above, you will have a file called pdficon_small.gif.  You need to copy this onto your WSS 3.0 server, into drive:Program FilesCommon FIlesMicrosoft SharedWeb Server extensions12TEMPLATEIMAGES.
4. Next you need to edit the XML file which WSS uses to link file extensions to icons.  This file is called DOCICON.XML and is located at drive:Program FilesCommon FIlesMicrosoft SharedWeb Server extensions12TEMPLATEXML.  Navigate to that folder and locate the file.  I would suggest making a backup copy first, then opening the file in NotePad.  You need to add a mapping key for PDFs at the bottom of the file, above the </ByExtension> closing tag.  The new key will be <Mapping Key=”pdf” Value=”pdficon_small.gif” OpenControl=”"/>  (note that XML is case sensitive so make sure you use same case as previous entries).  Then save the file.
5. That’s pretty much it, but if you already have PDFs uploaded to your WSS server I would recommend starting a full crawl.  You can do the with STSAdm, the command syntax is Stsadm -o spsearch -action fullcrawlstart .  More on this on TechNet here.