Adobe Pagemaker has a dedicated function for PDF export. Without the actual program, it will be very hard to convert PM5 files as PDF documents, if not impossible.
Convert Adobe PageMaker 5 document to Adobe Portable document format.
We have found 2 software records in our database eligible for .pm5 to .pdf file format conversion.
Microsoft Windows software - convert pm5 to pdf on Windows
One of the first desktop publishing programs on market
Convert from pm5 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 pm5 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.
Apple macOS / Mac OS X software - convert pm5 to pdf on OS X
Mac version of once popular publishing program