Here's what you would need to implement to track clicks to a PDF in Marketo:
1 - Load Marketo's Munchkin tracking code on the page that links to the PDF
2 - When a user clicks on the link to the PDF,
Munchkin's Click Link method needs to be calledAsk your developer to bind an event handler to the "click" event. This event handler will then trigger the Click Link Munchkin method.