In the 2010\PDF folder, the readme.txt file says:
"The official PDF icon is available here: http://helpx.adobe.com/content/dam/kb/en/837/cpsid_83709/attachments/AdobePDF.png
Place the .zip (or the extracted .msi) in this folder along with the AdobePDF.png, and AutoSPInstaller can automatically install them in order to be able to index PDF files and display the icon properly in SharePoint search results, document libraries, etc."
However, the function looks for pdficon_small.png - so the downloaded png needs renaming, otherwise the function goes off to the internet to download it again.
"The official PDF icon is available here: http://helpx.adobe.com/content/dam/kb/en/837/cpsid_83709/attachments/AdobePDF.png
Place the .zip (or the extracted .msi) in this folder along with the AdobePDF.png, and AutoSPInstaller can automatically install them in order to be able to index PDF files and display the icon properly in SharePoint search results, document libraries, etc."
However, the function looks for pdficon_small.png - so the downloaded png needs renaming, otherwise the function goes off to the internet to download it again.