PDF Image Reverser

This program enables you to extract embedded images from Adobe PDF documents.
The app provides a very easy-to-use and drag-and-drop interface with support for PNG, TIFF, JPEG, BMP, and GIF output formats.

Also the app can extract images with alpha channel kept (for PNG output) and can dump embedded JPEG stream directly without losing quality (for JPEG output).
Moreover you can open multiple files at the same time.