/usr/lib/libreoffice/share/extensions/DmathsAddon/CmathOOo/ is in libreoffice-dmaths 3.4+dfsg1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/libreoffice/share/extensions/DmathsAddon/CmathOOo/DialogChoixInsertionF8.xdl
/usr/lib/libreoffice/share/extensions/DmathsAddon/CmathOOo/DialogPoliceFormules.xdl
/usr/lib/libreoffice/share/extensions/DmathsAddon/CmathOOo/DialogStrings_de_DE.properties
/usr/lib/libreoffice/share/extensions/DmathsAddon/CmathOOo/DialogStrings_en_US.properties
/usr/lib/libreoffice/share/extensions/DmathsAddon/CmathOOo/DialogStrings_fr_FR.default
/usr/lib/libreoffice/share/extensions/DmathsAddon/CmathOOo/DialogStrings_fr_FR.properties
/usr/lib/libreoffice/share/extensions/DmathsAddon/CmathOOo/RegisteredFlag
/usr/lib/libreoffice/share/extensions/DmathsAddon/CmathOOo/dialog.xlb
/usr/lib/libreoffice/share/extensions/DmathsAddon/CmathOOo/mCmathOOo.xba
/usr/lib/libreoffice/share/extensions/DmathsAddon/CmathOOo/mCopy2Spip.xba
/usr/lib/libreoffice/share/extensions/DmathsAddon/CmathOOo/mDocumentEnumeration.xba
/usr/lib/libreoffice/share/extensions/DmathsAddon/CmathOOo/mFormuleLaTeX2OOo.xba
/usr/lib/libreoffice/share/extensions/DmathsAddon/CmathOOo/mFormuleOOo2Tex.xba
/usr/lib/libreoffice/share/extensions/DmathsAddon/CmathOOo/mImportFromLaTeX.xba
/usr/lib/libreoffice/share/extensions/DmathsAddon/CmathOOo/mTextToClipboard.xba
/usr/lib/libreoffice/share/extensions/DmathsAddon/CmathOOo/script.xlb