Use a pdf as chart background

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I would like a user to select a pdf file (a single page pdf ) and have that pdf file displayed in a chart background. I achieve that with image files, but not pdf files, using the following VBA code:

Sub AddImageToNewChartBackground()
sFileName = Application.GetOpenFilename
With Activesheet.ChartObjects.Add
.Chart.ChartArea.Fill.UserPicture PictureFile:=sFileName
End With
End Sum

If I try the above subroutine with a pdf I get an error. I thus have two questions:

1. Is there a way to use a pdf as a chart background?

2. Is there a way , using VBA, to convert a given pdf file to an image format (perhaps calling some other program)?

Note: the pdf/image MUST be in the chart background rather than a floating object seen through a transparent plot area. I use mouse click events and if there are floating objects then my mouse clicks select the objects and the coordinates of my click are not captured. Thus "Insert...Object...Create from file" to get a pdf on a worksheet then paste the object into the chart does not work. Besides, the resolution of the embedded pdf object is terrible; does anyone know how to fix that problem?


Thanks