SolidWorks is the only software that actually uses .sldtbt files and it is unlikely these table templates can be actually exported to PDF format, which is what sldtbt to pdf conversion implies. You can of course export standard SolidWork content (parts) to 3D PDF format, but that is used with different formats.
Of course if are in need of a specific operation with .sldtbt, you can always try to approach SolidWorks' supports with your issue.
Updated: November 2, 2023