, other PDF can be read into a string, but this is not a PDF, Error3 warning, what does encryption, or what problem, what is behind the coding format, b 'x \ x9c \ \ xd9 \ x8e xed} \ \ \ xc9n \ xed {} E \ \ xc7 XFD @ o & lt; \ x00 \ x86 \ x1f \ x0c \ XDB \ x17 \ x06 \ XFCBT \ x0,,,,