A Microsoft Word document is the safest bet for submitting your resume. There have been surveys done that show employers and recruiters prefer a Microsoft Word document over PDF. A Microsoft Word document is easily opened by many programs and devices. An Applicant Tracking System (ATS) could easily read a resume.
What is the advantage of PDF over Word?
Reliability. The PDF file format is reliable. When you create a PDF file containing any amount of data such as paragraphs, images, vector graphics, tablets, etc., it will always display that data in the exact same way no matter where you are viewing it.