PDF is the obvious successor. Though there are some things you can do with PS you can't do with PDF, because PDF AFAIU isn't a Turing complete language (though newer versions of PDF allow embedding of Javascript, IIRC).
> (though newer versions of PDF allow embedding of Javascript, IIRC)
Which comes with its own security issues/problems, especially since adobe is the leading figure of pdf viewing/processing.
PDF 2.0 removed a lot of old crap, like xfa… and postscript but they kept JavaScript
