Can a PDF Have a Virus? Yes, Here’s How To Stay Safe.

Updated on March 31, 2025.

A virus is a type of malware, which is malicious software intended to infect your device and steal your private information. It can only attack when you interact with it, like when you open a PDF that contains a virus. Hackers hide viruses by embedding them in malicious code within PDF files. Since PDFs are so widely used, hackers exploit them to compromise your privacy while going unnoticed.

Continue reading to learn how PDFs can contain viruses, what happens when you open a virus-infected PDF and how you can stay protected against malicious PDFs.

How can PDFs have viruses?

Viruses can live inside PDFs through hidden code, system commands and embedded objects. Many web browsers support JavaScript, a programming language that can be embedded in PDFs. Hackers use this to their advantage, hiding malicious code in JavaScript to exploit security vulnerabilities within a PDF. Just opening a compromised PDF can set off a domino effect, with the virus infecting other files and apps on your device. Hackers may even assume that you have antivirus software installed, so they may embed hidden objects in PDF files to go undetected and gain unauthorized access to your private information.

Can opening a PDF give you a virus?

Although not all viruses trigger an immediate infection by simply opening a PDF, some viruses are coded to activate as soon as you view the infected file. The risk of infection increases if the virus is hidden in an interactive element of the file. For example, you may receive a PDF in an unsolicited email, but malware may not impact your device unless you click on a specific link or image within the file.

What happens if you open malicious PDF files?

The consequences of opening a malicious PDF file depend on what a hacker wants with your information. Some hackers may want to infect your device with spyware to monitor your online activity and collect private information, potentially leading to fraud or identity theft. Other hackers may infect your device with ransomware to lock you out of your device until you pay a ransom. Regardless of a hacker’s motive, once you interact with a malicious element of a PDF, the virus will do whatever the hacker has programmed it to do – whether that’s stealing your data, gaining unauthorized access to your device or spreading malware to other systems.

How to stay safe against PDF viruses

PDFs are used all the time, but they can also be a haven for malware if you’re not careful. Here’s how to protect your device from dangerous PDFs and avoid becoming a victim of cyber threats.

Never interact with suspicious emails

Suspicious emails usually contain malicious attachments, like PDFs, designed to infect your device. These emails may be phishing attempts, where hackers impersonate trustworthy individuals or companies to steal your personal information. Signs to look out for when you receive a phishing email include unfamiliar senders, urgent language, grammatical errors or suspicious links.

Check PDFs for viruses before opening them

Antivirus software can detect and remove known viruses from your device, so always scan PDFs before opening them. Once you install antivirus software, you can scan individual files or your entire device. The software compares your files to a database of known viruses, and it will automatically isolate and delete any detected viruses before they cause harm.

Use secure PDF readers

Protect your information from hackers and viruses by using a secure PDF reader. Choose a reliable reader that has frequent updates to address new security vulnerabilities and fix bugs. Disable JavaScript plugins since those are used to hide malware. A trusted PDF reader will help prevent unauthorized access and protect your device from viruses – even those hiding in PDF files.

Keep your software and Operating System (OS) updated

Keep your software updated to protect against viruses in PDFs. These updates fix security weaknesses, improve performance and include the addition of new features, helping to protect your device from viruses. Install the latest OS version to protect yourself from potential infections.

Mark phishing emails as spam

If you receive a suspicious email with a PDF attachment, mark it as spam and report it. This helps your email provider recognize and block future phishing attempts from harming you and others. Just deleting the email won’t stop the sender from sending you more, but marking it as spam teaches your provider how to filter similar cyber threats.

Avoid falling victim to PDF malware

Some suspicious emails are clearly spam, but don’t let a PDF fool you into clicking on something that could infect your device with a virus. Even though not all PDF files containing viruses will infect your device just by viewing them, you should always be cautious by avoiding any emails with suspicious links or attachments, checking PDFs for viruses with antivirus software and marking phishing attempts as spam.