Convert pdf to hdr Online: pdf2hdr

You can use Tom's Editor to easily convert images from
Portable Document Format .PDF to Radiance RGBE image .HDR.
Tom's Editor is a free, online image manipulation and converter program.

Go to Tom's Editor

PDF

Adobe PDF format is the most popular document format. Overcomplicated. Offers compression.

HDR

Radiance RGBE image is an image format with extension HDR.