/usr/bin/assistant_adp is in qt-assistant-compat 4.6.3-7.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/bin/../lib/x86_64-linux-gnu/qt4/bin/assistant_adp
/usr/bin/../lib/x86_64-linux-gnu/qt4/bin/assistant_adp