PDF can be generated by a commercial product called PDFWriter, available from Adobe. Postscript can be generated by selecting a suitable postscript printer driver, and printing to a file. In practice, either the ``Generic Postscript Printer'' or ``Apple Laserwriter'' drivers generate device independent postscript, but many others generate proprietry extensions to postscript. Please check that freeware ghostscript-based viewers can correctly interpret your file.