Coupled with the lack of builtin compression in contemporary PDF versions (and a strange but widespread aversion to gzipped pdf), perhaps, but then there should

Coupled with the lack of builtin compression in contemporary PDF versions (and a strange but widespread aversion to gzipped pdf), perhaps, but then there shouldn’t be anything special about those particular companies. Maybe there isn’t, though, maybe that’s just where I come across mid-to-late-90s PDFs.