Method 3 – Adobe Acrobat Reader
Another method that I have used that works well is using the free Adobe Acrobat Reader program. First, go ahead and open your PDF file and scroll down to where the image you want to capture is located.
Next, click the Edit menu and select Take a Snapshot.
At this point, you could simply click and drag your mouse over the area of the image to capture a screenshot, but a better way is to click on the Edit menu again and choose Select All.
Now right-click on the image in the PDF file and you’ll see an option called Copy Selected Graphic.
The image will be copied to the clipboard and you can paste it into any image editing program to save it out in your preferred format. I prefer to do the select and copy procedure because it grabs just the image without any extra parts of the screen.