Extraction SDK not returning known content

I am having issues getting the Extraction SDK to return complete text from a provided PDF.  I am using the .NET Core sample projects.  I have tried all of the extraction examples and the returned Json only returns a bit of the PDF header text and some footer text.  The PDF has a table in it, but the text is all selectable, so it's not an embedded image.  I can't find any other configuration settings that impact the response from the extraction call.  Any guidance is appreciated.