Extract Images from PDF in C# | https://blog.aspose.com/2021/06/15/extract-images-from-pdf-in-csharp/

extract-images-from-pdf.cs

// Open document
Document pdfDocument = new Document("candy.pdf");

int imageCounter = 1;

// Loop through pages
foreach (var page in pdfDocument.Pages)
{
    // Loop through all images
    foreach (XImage image in page.Resources.Images)
    {
        // Create file stream for image
        FileStream outputImage = new FileStream(String.Format("Page{0}_Image{1}.jpg", page.Number, imageCounter), FileMode.Create);

        // Save output image
        image.Save(outputImage, ImageFormat.Jpeg);

        // Close stream
        outputImage.Close();

        imageCounter++;
    }

    // Reset counter
    imageCounter = 1;
}

Read the article: https://blog.aspose.com/2021/06/15/extract-images-from-pdf-in-csharp/