The quick way to do it is to choose the view to which you want to insert the drawing > set the scale to the same as pdf drawing > drag the pdf file into the view > right-click the drawing object > explode into current view.
This results in the PDF vectors being converted to AC lines to which you can snap.
To be precise, no, the pdf has nothing in it you can snap to. But yes, like thesleepofreason has said it. However, - if you explode the .pdf and it is not the scale you wanted, you can select all of it and resize it the same way you can resize a 2d image to a known scale. Sometimes the .pdf is generated as print-to-fit and might be some very odd scale.