/usr/lib/scilab/libscigraphics.so.5 is in scilab-full-bin 5.3.3-6.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/scilab/libscigraphics.so.5.3.3
/usr/lib/scilab/libscigraphics.so.5.3.3