Thank you Glenner003

it works

PdfCanvas gxf;
ImageData ImageDataGlobal =ImageDataFactory.Create( byte[] MyImage)
AffineTransform affineTransform = AffineTransform.GetTranslateInstance(Pos.X,Pos.Y);
 affineTransform.Concatenate(AffineTransform.GetScaleInstance(Size.X,Size.Y));
 affineTransform.Concatenate(AffineTransform.GetRotateInstance(RandomRadiant));
 float[] matrix = new float[6];
 affineTransform.GetMatrix(matrix);
 gfx.AddImageWithTransformationMatrix(ImageDataGlobal, matrix[0], matrix[1], matrix[2], matrix[3], matrix[4], matrix[5]);