In addition to the information provided by Sukrit, I would like to inform you that you can use the export pdf Online service as well for conversion, if you don't have acrobat, Here's the link to access the service : https://cloud.acrobat.com/exportpdf
Once you access the webpage, you need to select the file to be exported,Once the selected file is uploaded, you have to choose 'image' under 'convert to' drop down, and then you can select the image format and image quality and click export. Once the file is exported, you can download it to your pc.
Note Pat Willener's caveat - you need a PDF Pack or Adobe Acrobat DC subscription to use https://cloud.acrobat.com/exportpdf export a PDF file to JPEG. A subscription to Adobe ExportPDF only provides for converting PDF files to .docx/.rtf/.xlsx formats.