You can generate mass PDFs using this module, it provides a new action - Generate bulk PDF - for Views Bulk operations.
Model node: a node with tokens in the body
Data node: nodes selected by VBO
After the action is completed, you can download a PDF, contains the model node (as many times as the number of selected data nodes), each time filled with the tokens from the data node. It uses dompdf module for PDF library.
See README.txt for more verbose description.
WARNING: currently it depends on
dompdf is resource consuming, you maybe need lots of memory (and time) for PHP to finish the PDF generation.