The PHP PDO extension should be included by default, or at least it used to be... so you probably just have to enable it in php.ini http://php.net/manual/en/pdo.installation.php
I think that PDO extension are in /bin/php7/..., but i added extension=pdo.so and nothing is happened
Did you try '.\php -modules' from the folder with the PHP binary? If pdo doesn't show then I reckon you'll have to compile yourself, either manually or by adding that extension to the official compile script.