/usr/share/php/Symfony/ is in php-symfony-property-info 3.4.6+dfsg-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/php/Symfony/Component/
/usr/share/php/Symfony/Component/PropertyInfo/
/usr/share/php/Symfony/Component/PropertyInfo/DependencyInjection/
/usr/share/php/Symfony/Component/PropertyInfo/DependencyInjection/PropertyInfoPass.php
/usr/share/php/Symfony/Component/PropertyInfo/Extractor/
/usr/share/php/Symfony/Component/PropertyInfo/Extractor/PhpDocExtractor.php
/usr/share/php/Symfony/Component/PropertyInfo/Extractor/ReflectionExtractor.php
/usr/share/php/Symfony/Component/PropertyInfo/Extractor/SerializerExtractor.php
/usr/share/php/Symfony/Component/PropertyInfo/PropertyAccessExtractorInterface.php
/usr/share/php/Symfony/Component/PropertyInfo/PropertyDescriptionExtractorInterface.php
/usr/share/php/Symfony/Component/PropertyInfo/PropertyInfoCacheExtractor.php
/usr/share/php/Symfony/Component/PropertyInfo/PropertyInfoExtractor.php
/usr/share/php/Symfony/Component/PropertyInfo/PropertyInfoExtractorInterface.php
/usr/share/php/Symfony/Component/PropertyInfo/PropertyListExtractorInterface.php
/usr/share/php/Symfony/Component/PropertyInfo/PropertyTypeExtractorInterface.php
/usr/share/php/Symfony/Component/PropertyInfo/Type.php
/usr/share/php/Symfony/Component/PropertyInfo/Util/
/usr/share/php/Symfony/Component/PropertyInfo/Util/PhpDocTypeHelper.php
/usr/share/php/Symfony/Component/PropertyInfo/autoload.php