/usr/lib/gambas3/gb.pdf.so is in gambas3-gb-pdf 3.8.4-2ubuntu3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/gambas3/gb.pdf.so.0.0.0
/usr/lib/gambas3/gb.pdf.so.0.0.0