Loading a PDF file from project resources into Web Browser

I have a PDF file in my project that I want to display in web browser with WPF, I've managed to display the byte array, but I think I'm missing a content type or something. The code loads when the window opens.

        byte[] file = Properties.Resources.test;
        Stream source = new MemoryStream(file);

        PDFviewer.NavigateToStream(source);