problem with extracting some hebrew font

[alonmoor]

קסם חנוכה A3.pdf
ayom2p001.txt
ayomreg027.txt

ayom2p001.pdf
ayom2p027.pdf

$directory = 'private://filedepot';
$files = file_scan_directory($directory, '/.*/');
$i = 0;
foreach ($files as $file) {
if (pathinfo($file->uri, PATHINFO_EXTENSION) == 'pdf') {
$pdf = new PdfToText ($file->uri , PdfToText );
output ( $pdf -> Text ) ;