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As a rule, such emails are executed better than generic phishing emails and target specific recipients. There are two PDF-related variations of phishing:Īn approach very similar to regular phishing. You have probably heard about email phishing - hackers send you emails pretending to be somebody else and try to make you click links that will either steal your data or infect your computer with a virus. A non-certified plugin below might be a threat and should be disabled. Native certified plugins in Foxit Reader have JavaScript (JS) enabled.

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Third-party plugins in PDF-reading software can also be a gateway for malicious scripts - if possible, you should disable them. This way, PDF readers become unwilling accomplices of hackers because either the apps themselves or their plugins will be able to run the injected code. PDF files need PDF reading software to open and display their contents.

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Unfortunately, hackers will likely use more technically intricate ways to add malicious code to PDF files. It's possible to add such scripts with the help of JavaScript using software like Adobe Acrobat Pro. For example - in addition to fill and sign functionality - they can display the current date, add print buttons, format data, perform calculations on the input, etc. PDFs often contain scripts for extended capabilities. Let's look at how PDF files containing malware infect your computer and where such files usually come from. How can an infected PDF contaminate your computer? This is because the software for opening and editing PDF files on desktop and laptop computers can interpret and run the malicious code injected by a hacker.

PC and Mac machines are the most vulnerable to threats hidden in ebooks. However, many viruses are emerging for iOS, too, so it's worth being cautious. iOS devices should be safe from viruses in PDF files due to app memory sandboxing. Unfortunately, Android-based e-readers with regular touchscreens (devices like Amazon's Kindle Fire) are potentially vulnerable. Dedicated e-reader devices run an extremely abridged version of Linux OS or a custom OS under the hood, so are unable to interpret and run malicious scripts. This is why a PDF virus cannot infect most older e-readers and modern e-paper and e-ink books. Are PDF books safe?Ī PDF is not an executable file, so it cannot infect your machine while sitting idle on your hard drive - the malware in a PDF needs to be interpreted and executed through PDF reader software. While their malware hides inside macros scripts, an infected PDF file will contain malicious JavaScript code. The mechanics are very similar to virus-infected Microsoft Word files. PDFs can have viruses that come embedded with a code that makes documents signable and (somewhat) editable.

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Let's see what dangers can hide within PDF files and how to counter them. Worse still - your PDF might turn out to be nothing but a virus disguised as a PDF file. When you download a book, hard-to-find scientific report, or free PDF template for your small business (especially if such documents come from untrustworthy websites), you might find a nasty surprise inside. And a virus hiding within a PDF file can quickly infect your computer, be it a PC or even a Mac. Unfortunately, this means that malicious code can be lurking within or alongside such scripts.

They work inside PDFs with the help of special scripts. The “fill & sign” abilities of PDFs are where the danger lies. Since you cannot just open a PDF and edit it as you please (even if you have special and often pricey software), PDFs are used for contracts, bank statements, and any other important documents that need to be signed and sent. PDF files are not easily editable compared to rich text files like Microsoft Word's DOCX or Apple's PAGES files. It can be found everywhere from schools to offices and banks, successfully replacing print-outs - and that's why malicious actors love it, too.

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The Portable Document Format - or PDF as we know it - is probably one of the most frequently used file formats for sending documents.

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