gistfile1.js

// saw this on Forrst, forget who posted it though 

$('[href$="pdf"],.pdf').live("click", function(){
	// get the link attribute and find the filename of the PDF
	var pdfLink = $(this).attr("href"),
			pdfLocation = pdfLink.substr(pdfLink.lastIndexOf("/")).replace("/","");

	_gaq.push(['_trackPageview', pdfLocation]);
});