Objective: There is growing awareness of need to assess for malingering in adult referrals for Attention Deficit Hyperactivity Disorder (ADHD). As much of ADHD diagnosis is based on self-report, it is imperative to examine accuracy of self-reported symptoms; yet few ADHD measures include validity scales. The Minnesota Multiphasic Personality Inventory -2 Restructured Format (MMPI-2-RF) includes well developed validity scales, some specifically designed to assess for malingered neurocognitive symptoms. We examined the effect of ADHD malingering on MMPI-2-RF scales. Method: Using a simulator design, undergraduate students were randomly assigned to 1) malinger ADHD for the purposes of receiving stimulant medication, 2) malinger ADHD for the purposes of receiving extended time accommodations, or 3) give their best effort. They were given a large battery of self-report and neuropsychological tests, including the MMPI-2-RF, which was the focus of the present analyses. Results: Both types of malingerers performed significantly higher on Infrequent Responses (F) and Response Bias Scale (RBS) subscales as compared to controls, and they also scored higher on Antisocial Behavior, Cognitive Complaints, Juvenile Conduct Problems, and Disconstraint subscales. However, only the malingering group seeking extra time accommodations scored significantly higher than controls on Demoralization, Dysfunctional Negative Emotions, Hypomanic Activation, and Negative Emotionality subscales. Conclusion: Results suggest that inclusion of a well-validated psychological instrument like the MMPI-2-RF would aid in the detection of noncredible self-report in individuals malingering ADHD. Results also raise preliminary evidence that the purpose of the malingering (stimulant medication versus extra time accommodation) may affect the nature of symptoms reported by malingerers.