None of these GIF images will convert correctly using the Aspose.Imaging library. Some result in black images, others just render as random line patterns. We are using Aspose.Imaging 19.2.0.
Here is a snippet of code that we are using to convert the images:
using (Aspose.Imaging.Image image = Aspose.Imaging.Image.Load(gifFilePath))
var imagePdfOptions = new Aspose.Imaging.ImageOptions.PdfOptions();