Do so by opening the white Adobe Acrobat app with the stylized, red A icon. Then click on File in the menu bar at the top of the window, click on Open..., select the PDF document you want to convert to JPEG and click on Open. Adobe Acrobat Pro is a paid program. If you don't have it already, you're better off using one of the above methods. It's either a tab in the upper-left corner of the window (Windows) or a menu item in the top-left side of the screen (Mac). It's near the middle of the File drop-down menu. Selecting it prompts a pop-out window to appear. This option is near the bottom of the Save As... pop-out window. Another pop-out window will appear. It's at the top of the pop-out menu. This will prompt a new window to open. Click a folder in which you want to save the image. You can also adjust the image's quality here by clicking Settings on the right side of the pop-up menu and then selecting your preferred image quality. It's at the bottom of the window. This will save your converted PDF on your computer.

TL;DR in Indonesian:
Buka berkas PDF menggunakan Adobe Acrobat Pro. Klik File. Klik Save As…. Pilih Image yang berada di bagian bawah jendela pop-out Save As... Klik JPEG yang terdapat di bagian atas menu pop-out. Tentukan lokasi penyimpanan berkas. Klik Save.