I'd use a CLI program called "pstoedit" (which converts PostScript to other vector formats) to change the PDFs into DXF files. Then I'd import the DXFs into DipTrace (or the CAD software of your choice) and set the primary layer as pads. Then you could export it to a Gerber.
The first PDF you posted would be problematic because it's two layers and they've got the bottom traces contrasted to the top layer.
The second PDF could be converted easily.