Man pages matching name pdf::api2::basic::pdf::filter in section 3pm:

PDF::API2::Basic::PDF::Filter.3pm.en	debian 10 / libpdf-api2-perl
PDF::API2::Basic::PDF::Filter.3pm.en	debian 11 / libpdf-api2-perl
PDF::API2::Basic::PDF::Filter.3pm.en	debian 12 / libpdf-api2-perl