New Post: Convert PDF with Vector Graphics to Transparent PDF

I have a PDF file which contains a vector graphics logo on a transparent background (if you open it in Photoshop CC 2017, you see the transparent area displayed correctly).

I want to convert that PDF to a transparent PNG. But the PNG which is created has a white (instead of transparent) background.

I have no problem converting one transparent PNG to another PNG, so I assume my problem is how I am reading the PDF.

What should I do?

TIA,
Lavie