PHP：解析的PDF文件充满了控制字符

I've got a problem parsing this pdf-file:

http://www.transperfect.com/sites/default/files/imported/pdf/Tokyo_Client_Services_Representative.pdf

After I encoded the FlateDecode decoded pdf-file the output is something like this:

Usually it's easy to parse the content, because the text content is always inside the opened "(" and closed ")" bracket but this pdf-file is giving me a headache. It seems like there are just control-characters inside the brackets.

My current output is the following:

Anyone here who have a clue about this ? What am I doing wrong ?