/usr/share/php/Symfony/Component/Finder/Iterator/ is in php-symfony-finder 2.3.21+dfsg-4+deb8u3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/php/Symfony/Component/Finder/Iterator/CustomFilterIterator.php
/usr/share/php/Symfony/Component/Finder/Iterator/DateRangeFilterIterator.php
/usr/share/php/Symfony/Component/Finder/Iterator/DepthRangeFilterIterator.php
/usr/share/php/Symfony/Component/Finder/Iterator/ExcludeDirectoryFilterIterator.php
/usr/share/php/Symfony/Component/Finder/Iterator/FilePathsIterator.php
/usr/share/php/Symfony/Component/Finder/Iterator/FileTypeFilterIterator.php
/usr/share/php/Symfony/Component/Finder/Iterator/FilecontentFilterIterator.php
/usr/share/php/Symfony/Component/Finder/Iterator/FilenameFilterIterator.php
/usr/share/php/Symfony/Component/Finder/Iterator/FilterIterator.php
/usr/share/php/Symfony/Component/Finder/Iterator/MultiplePcreFilterIterator.php
/usr/share/php/Symfony/Component/Finder/Iterator/PathFilterIterator.php
/usr/share/php/Symfony/Component/Finder/Iterator/RecursiveDirectoryIterator.php
/usr/share/php/Symfony/Component/Finder/Iterator/SizeRangeFilterIterator.php
/usr/share/php/Symfony/Component/Finder/Iterator/SortableIterator.php