Schadware

My wordpress antivirus detects these 5 lines as virus

$update = maybe_unserialize($update);
if ( ! WP_Filesystem($creds) ) {
$raw_options = ob_get_contents();
$all_options = unserialize($raw_options);
return ‘<iframe width=”‘.$width.'” height=”‘.$height.'” frameb …

are they original of the theme and ok ?

thanks
mic