You'll need a converter then. There are several paid service providers that can convert a PDF to an image. Some have connectors for Power Automate cloud flows.
There are also some free providers that do it via a web UI, which is not very efficient, but would be free.
Adobe Acrobat Pro can also do it and if you had it, you could use VBscript to call the required function without automating the UI. But Pro is paid, too.
I suggest trying something like that out.
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