MacOS X can save documents directly as PDF (Portable Document Format) from any kind of native MacOS X application. There is no need to install an external driver or use a converter. This feature can be accessed from the Print dialog: if you click the Preview button, the output will be opened in a Preview window (standard MacOS X application) without saving. Clicking the Save As PDF button will open a Save to File dialog box, where you can specify the desired name and location of the PDF file.
Note: PDF stores ArchiCAD drawings in vector-based format, however raster images like figures or bitmap patterns will be optimized for screen presentations (exported using screen resolution).