Thanks for your posting and using Aspose.Total.
Aspose.Cells which is a part of Aspose.Total can convert your Ms-Excel files (xls/xlsx etc) into pdf.
Please see the following document for your more help.
Thanks for considering Aspose. You can easily convert different image formats to Pdf using Aspose.Pdf and convert xls/xlsx files to Pdf using Aspose.Cells.
Please find below the documentation link for details and code snippets. Hopefully it will serve the purpose.
Please feel free to contact us for any further assistance.