MOSS doesn't install an icon for PDF files by default. It simply shows a generic white paper icon.
This is my procedure for fixing this issue:
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Download an appropriate icon for pdf document types.
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This is the icon from Adobe.
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Save to TEMPLATEIMAGES directory. (DEFAULT: C:Program FilesCommon FilesMicrosoft Sharedweb server extensions12 emplateimages)
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Open the file docicon.xml. (DEFAULT: C:Program FilesCommon FilesMicrosoft Sharedweb server extensions12 emplatexmldocicon.xml)
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Add a new Mapping element to the ByExtension element.
<Mapping Key="pdf" Value="pdficon_small.gif" />
NOTE: Be sure to change pdficon_small.gif to whatever image you downloaded to represent pdf documents. -
Save the edited docicon.xml file.
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Restart IIS (iisreset /noforce).
You should now see the PDF icons for all PDF documents in the portal, including search results.