Below you can see a samle how to uncompress or unpack a PDF file in C#, you can port this C# example to VB.NET or ASP.NET code easily,
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Call_PDFToolBoxCom
{
class Program
{
static void Main(string[] args)
{
string strExePath = System.AppDomain.CurrentDomain.SetupInformation.ApplicationBase;
PDFToolBoxCom.PDFToolBoxCom p = new PDFToolBoxCom.PDFToolBoxCom();
string strReturn = p.RunCMD(@"D:\temp\test.pdf -outfile D:\temp\out.pdf -unpack -$ XXXXXXXXXXXXXXXXXXX");
Console.WriteLine(strReturn);
Console.WriteLine("Please enter any key to continue...");
Console.ReadKey();
}
}
}