/usr/lib/libreoffice/share/extensions/DmathsAddon/Dmaths2/ is in libreoffice-dmaths 3.4+dfsg1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/libreoffice/share/extensions/DmathsAddon/Dmaths2/AxesDialog.xdl
/usr/lib/libreoffice/share/extensions/DmathsAddon/Dmaths2/AxesDialogFns.xba
/usr/lib/libreoffice/share/extensions/DmathsAddon/Dmaths2/AxesDrawing.xba
/usr/lib/libreoffice/share/extensions/DmathsAddon/Dmaths2/AxesSetup.xba
/usr/lib/libreoffice/share/extensions/DmathsAddon/Dmaths2/DialogStrings_de_DE.properties
/usr/lib/libreoffice/share/extensions/DmathsAddon/Dmaths2/DialogStrings_en_US.properties
/usr/lib/libreoffice/share/extensions/DmathsAddon/Dmaths2/DialogStrings_fr_FR.default
/usr/lib/libreoffice/share/extensions/DmathsAddon/Dmaths2/DialogStrings_fr_FR.properties
/usr/lib/libreoffice/share/extensions/DmathsAddon/Dmaths2/DrawModule.xba
/usr/lib/libreoffice/share/extensions/DmathsAddon/Dmaths2/FractionFunctions.xba
/usr/lib/libreoffice/share/extensions/DmathsAddon/Dmaths2/GraphDialog.xdl
/usr/lib/libreoffice/share/extensions/DmathsAddon/Dmaths2/GraphDialogFns.xba
/usr/lib/libreoffice/share/extensions/DmathsAddon/Dmaths2/GraphDrawing.xba
/usr/lib/libreoffice/share/extensions/DmathsAddon/Dmaths2/NumberFunctions.xba
/usr/lib/libreoffice/share/extensions/DmathsAddon/Dmaths2/PiDialog.xdl
/usr/lib/libreoffice/share/extensions/DmathsAddon/Dmaths2/PiDialogFns.xba
/usr/lib/libreoffice/share/extensions/DmathsAddon/Dmaths2/RegisteredFlag
/usr/lib/libreoffice/share/extensions/DmathsAddon/Dmaths2/dialog.xlb
/usr/lib/libreoffice/share/extensions/DmathsAddon/Dmaths2/script.xlb