This is a step-by-step guide to setup and configure Adobe PDF file search in SharePoint 2010.
Download the Adode iFilter from the following url.
Download the pdf icon file. Download a 16*16 gif or a png file. Or else you can download it from the below url. http://www.adobe.com/misc/linking.html
Extract the zip file and install the PDFFilter64installer file which you downloaded in Step 1.
Open the “Run” window and open Registry Editor running the regedit command.
In Registry editor browse to location \\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office Server\14.0\Search\Setup\ContentIndexCommon\Filters\Extension
Name it as .pdf.
Now is the time to set the icon for pdf files.
Copy/Move the pdf icon you downloaded in in Step 2 to the following folder.
C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\14\TEMPLATE\IMAGES
Next open “Internet Information Services (IIS) Manager and Stop the service.
This step is required as you are going to amend a file which is currently in use.
Save the file.
Start IIS Service