打印XML数组时出现问题

我有以下代码，它拿走了我所有的XML字段中的"money"，但只有一条记录，并显示了这个错误：

错误：

 Warning: SimpleXMLElement::__construct(): Entity: line 1: parser error : Start tag expected, '<' not found in /var/www/client/lib/class/index.php on line 34
Warning: SimpleXMLElement::__construct(): %PDF-1.4 in /var/www/client/lib/class/index.php on line 34
Warning: SimpleXMLElement::__construct(): ^ in /var/www/client/lib/class/index.php on line 34
Fatal error: Uncaught exception 'Exception' with message 'String could not be parsed as XML' in /var/www/client/lib/class/index.php:34 Stack trace: #0 /var/www/client/lib/class/index.php(34): SimpleXMLElement->__construct('%PDF-1.4?%?????...') #1 /var/www/client/lib/class/index.php(47): uuid->select() #2 {main} thrown in /var/www/client/lib/class/index.php on line 34

我的代码：

$data = $this -> conect -> conexion();          
           $dbquery = $data -> prepare("SELECT * 
                                        FROM FILE 
                                        ORDER BY ID
                                      ");

                 $dbquery->execute();
       while($rows = $dbquery->fetch(PDO::FETCH_ASSOC)){
              $string = $rows['BYTES'];
                $tuxml = new SimpleXMLElement($string);
         echo $tuxml->attributes()->Moneda;