Programs like phoneMiner or ABC BlackBerry Converter can help users to extract the contents of BlackBerry .bbb backups and exporting a broad range of various files from it, including PDF documents.
Convert BlackBerry backup (post 2012) file to Adobe Portable document format.
We found 2 software records in the database related to .bbb to .pdf file format conversion.
Microsoft Windows software - convert bbb to pdf on Windows
A backup and recovery software for smartphones
Convert from bbb file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned bbb to pdf. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
A conversion utility for BlackBerry backups