Laserwriter 8.5.1: Acrobat PDF Option Unavailable?

How do I create PDF format files using LW 8.5.1? According to page 135 of the Laserwriter 8500 user's guide, documents can be saved as PDF files using the Laserwriter 8.5.1 driver. When I try this, the option is grayed out and is therefore unavailable.
Below is the PDF printing requirement as documented in the LW 8.5.1 Apple Printer Software Read Me file:

Acrobat Save as File Format - LaserWriter 8.5.1's Save-As-File panel adds Acrobat PDF as one of the supported formats. You must have the full version of Acrobat 3.0 or later installed for this option to be enabled. The Acrobat Reader alone is not sufficient. The application may be purchased from Adobe Systems. For some applications, PDF formatting can be performed in the background only.

Turning on Balloon Help and viewing the help messages for the Print dialog confirms this.
Published Date: Feb 18, 2012