CUPS-PDF is a PDF writer backend for CUPS.
It provides a virtual CUPS-PDF printer which produces PDF files
so that application programs which have no built-in support
to "Save as PDF" could print to CUPS-PDF to get a PDF file.
For details see /usr/share/doc/packages/cups-pdf/README
and <a href="http://en.opensuse.org/SDB:Printing_to_PDF">http://en.opensuse.org/SDB:Printing_to_PDF</a>
There is no official package available for openSUSE Leap 15.4