Imagine, that in 15 minutes after reading this text you will be able to provide API for your application to read tables from a PDF and convert them in Excel-spreadsheet, using C# or VB.Net.

           SautinSoft.PdfFocus f = new PdfFocus();
            f.OpenPdf(@"d:\Invoice.pdf");

            if (f.PageCount > 0)
                f.ToExcel(@"d:\Invoice.xls");          

PDF Focus .Net is standalone .Net assembly. It provides you a full set of API to convert PDF documents into Excel workbooks.

Another point of interest is that PDF Focus .Net can understand and recreate real tables with rows and cells. Maybe it sounds obvious, but PDF documents don't have real tables. If you see a table inside a PDF, it is in fact a set of lines. To further accentuate this point, download PDF Focus .Net, 69.3 Mb and evaluate it now!

Your application will be able to recognize PDF documents with tables even with invisible borders and create from them an Excel spreadsheet.