When I open a pdf file from an email (happens on some but not all pdfs) Google Docs comes up with the correct title while showing the preview for my document. Then a second later, it changes the title to Chinese.
This happens in both Firefox and Chrome.
Before:
After:
Here's another example of English text:
JS 6.10.pdf - Powered by Google Docs
Here's the actual chinese it turns it into:
㽉㽮㽴㽵㽩㽴㽟㽑㽂㽏㽂㽟㽉㽮㽴㽥㽲㽮㽡㽬㼮㽰㽤㽦