The Output workspace/module is not available in Bridge.
The Output workspace/module for generating PDF contact sheets/presentations and Web Galleries did not ship Bridge. You can manually download and install the Adobe Output Module and workspace for Bridge following the directions in the following document:
You can also create contact sheets by selecting Tools > Photoshop > Contact Sheet II from Bridge, or File > Automate > Contact Sheet II from Photoshop.
You can create PDF Presentations by selecting File > Automate > PDF Presentation from Photoshop.
If you have a Creative Cloud All Apps plan, you can use Lightroom 5 to generate contact sheets and web galleries: