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Doug has it right. It's an acrobat capability.
It may also be a product view file inserted into the .pdf. There area few things that lead me to guess it could be a product view file.
- The toolbar lets you change the background color, but only of the bounding box for the isometric view.
- Like product view, the dynamic orientation of the model doesn't quite act the same as doing so to a pro/e file.
- When orientating the model, the corner runs into a clipping plane, revealing the interior of the component identically to using a sectioning plane in product view.
Of course, these could all be artifacts of converting the file to an acrobat format.