Comments by Majesss (Top 3 by date)

There are solutions, like this C# PDF library, that can enable you to do this.
You can find a C# code for reading PDF files and a C# code for converting to HTML (FYI you could embed images into HTML by using Data URI scheme).

I presume you had an issue with an older reference being used, when working with Microsoft Excel Interop in C# or VB.NET you need to update your references when updating Microsoft Office version.
You can however avoid this if you change your approach, for example by using this C# and VB.NET Excel library you could directly export your Excel data into a DataGridView control.