/usr/lib/x86_64-linux-gnu/libpoppler.so is in libpoppler-dev 0.26.5-2+deb8u4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libpoppler.so.46.0.0
/usr/lib/x86_64-linux-gnu/libpoppler.so.46.0.0