It should be simple enough to export BAY files as PDF documents in programs like XnConvert or some online conversion services.
Convert Kodak/Roper Bayer picture sequence file to Adobe Portable document format.
We have found 2 software records in our database eligible for .bay to .pdf file format conversion.
Multiplatform software - convert bay to pdf on any platform
Cross-platform batch image transcoder compatible with 500 picture image formats
Convert from bay 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 bay 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.
On-line services software - convert bay to pdf on web
An online graphics converter and resizer