rcpilot82,
You could also try this; Open PDF in Illustrator > export as DWG > open in Corel with import command. In some cases vector lines might have two layers on it, so just ungroup all ( right click > ungroup all ), remove and delete the top layer.
Check the color of the line > you get best cutting results if you change the line color to RGB ( R0.G0.B0 ).
Regards,
Hannu