Perhaps print them to a Postscript file via a virtual printer, then distill the Postscript file.
In theory, you can install a printer driver for a Postscript-capable printer on your machine, specify that as the printer, and then select "print to file" to generate a Postscript file. Then use Acrobat Distiller to open the .ps file and generate the PDF.
Apologies for the lack of detail, but I don't know Publisher.
In theory, you can install a printer driver for a Postscript-capable printer on your machine, specify that as the printer, and then select "print to file" to generate a Postscript file. Then use Acrobat Distiller to open the .ps file and generate the PDF.
Apologies for the lack of detail, but I don't know Publisher.