[Nottingham] unable to reaf pdf file containing png

[Paul Sladen]

On Sat, 2 Feb 2019, godfrey--- via Nottingham wrote:
> Anyone help me with this please? I am getting official messages as pdf 
> files but I cannot open them as images are in png format.

What does:

 $ file xyz.pdf

say the actual filetype is?

	-Paul

PS. The bit about PNG images does not quite make sense.  PDF format
has native support for JPEG images, but not for PNG images.  Is there
a URL to what you think might be the cause?