/usr/share/php/Composer/Util/ is in composer 1.0.0~beta2-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/php/Composer/Util/AuthHelper.php
/usr/share/php/Composer/Util/ComposerMirror.php
/usr/share/php/Composer/Util/ConfigValidator.php
/usr/share/php/Composer/Util/ErrorHandler.php
/usr/share/php/Composer/Util/Filesystem.php
/usr/share/php/Composer/Util/Git.php
/usr/share/php/Composer/Util/GitHub.php
/usr/share/php/Composer/Util/GitLab.php
/usr/share/php/Composer/Util/NoProxyPattern.php
/usr/share/php/Composer/Util/Perforce.php
/usr/share/php/Composer/Util/Platform.php
/usr/share/php/Composer/Util/ProcessExecutor.php
/usr/share/php/Composer/Util/RemoteFilesystem.php
/usr/share/php/Composer/Util/Silencer.php
/usr/share/php/Composer/Util/SpdxLicense.php
/usr/share/php/Composer/Util/StreamContextFactory.php
/usr/share/php/Composer/Util/Svn.php
/usr/share/php/Composer/Util/TlsHelper.php