SharePoint by default does not support and recognize PDFs. Follow this post to display a special icon for PDF files and discover them in SharePoint Search results.
1. Download and install Adobe PDF iFilter 9.
(For more information about how to download PDF iFilter 9, see Adobe PDF iFilter 9 on the Adobe Downloads website.)
2. Download the Adobe PDF file icon.
(For more information, see Use of Adobe icons and web logos on the Adobe website.)
IMPORTANT - Make sure you save the Adobe PDF file icon to the following file location on the SharePoint Server

Drive:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\14\TEMPLATE\IMAGES\
3. Add the mapping entry to the docIcon.xml file.
Open the docIcon.xml file in Notepad
IMPORTANT - The docIcon.xml file is located in the, Drive:\Program Files\ Common Files\ Microsoft Shared\ Web Server Extensions \14\ TEMPLATE\XML folder.

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