You will want to install the Save2PDF plugin
http://genomeview.org/plugins

Download the zip-file, and extract it.

Copy the jar file to your '.genomeview/plugin' folder.

On Linux, it should be (hidden) in your /home/ directory.
On Windows: C:\Users\\.genomeview\plugin

Next time you start GenomeView, there now should be a menu item under
'Plugins' saying "Export > Export image as PDF...".