I tried to convert a pdf file and system just dies. All processing die. I tried to put in a try { catch but it didn't work. Just die process.
You can get the pdf file in link below:
tseyor.org/archivos/triada/comparte ...
I used the same example code. Browser just say me "ERR_CONNECTION_RESET" and nothing load. 
	include ( '../../PdfToText.phpclass' ) ;
	function  output ( $message )
	   {
		if  ( php_sapi_name ( )  ==  'cli' )
			echo ( $message ) ;
		else
			echo ( nl2br ( $message ) ) ;
	    }
	try {
	$file	=  'sample' ;
	$pdf	=  new PdfToText ( "$file.pdf" ) ;
	output ( "Original file contents :\n" ) ;
	output ( file_get_contents ( "$file.txt" ) ) ;
	output ( "-----------------------------------------------------------\n" ) ;
	output ( "Extracted file contents :\n" ) ;
	output ( $pdf -> Text ) ;
	}
	catch(Exception $e)
	{
		output('Exception!');
	}
I tried (in another script) to log in a file after create class (and convert) or if exception ocurr, and nothing written in file.