/usr/share/icons/gnome/scalable/categories/ is in gnome-icon-theme-symbolic 3.12.0-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/icons/gnome/scalable/categories/applications-engineering-symbolic.svg
/usr/share/icons/gnome/scalable/categories/applications-games-symbolic.svg
/usr/share/icons/gnome/scalable/categories/applications-graphics-symbolic.svg
/usr/share/icons/gnome/scalable/categories/applications-multimedia-symbolic.svg
/usr/share/icons/gnome/scalable/categories/applications-science-symbolic.svg
/usr/share/icons/gnome/scalable/categories/applications-utilities-symbolic.svg
/usr/share/icons/gnome/scalable/categories/preferences-other-symbolic.svg
/usr/share/icons/gnome/scalable/categories/preferences-system-symbolic.svg
/usr/share/icons/gnome/scalable/categories/system-help-symbolic.svg