This is similar to the way you can click an icon in Word and go to the next page. Edit Properties of Adobe reader. LibreOffice is also a great choice to write and edit math equations.
Below is a recommended way to copy from PDF using Snap shot of Adobe R eader and paste the recognition result as mathtext on Word.
I have created a pdf file in LATEX and need to convert to Word. After opening a previously saved Word file containing MathType equations you discover all or some of the MathType objects have become non-editable pictures This is associated with the Auto-recovery function in Word. This is similar to the way you can click an icon in Word and go to the next page. Using Kutools for Words Convert Equation to Image utility is the most convenient way for converting equations in a range or the whole document to images in Word.