UTF-8 problem with PDF and native PHP

[ste101]

I have files with German umlauts (ä,ü) in meta data and there are problems with the PHP function.
With phpinfo -enc UTF-8 everything is ok.

When I upload this file char after the umlaut are cut. Within the extension configuration mapping tool the strings are empty.
If I do a mb_convert_encoding($out, 'UTF-8', 'UTF-8'); in decodeStringType the full sting is show but with a '?' instead of the umlaut.

[xperseguers]

Please attach a sample PDF file to reproduce that problem.