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Ensure that you update your Windows and your Anti-Virus program.ħ. The crooks are relying on the dilemma that you shouldn’t open a document until you are sure it’s one you want, but you can’t tell if it’s one you want until you open it. Be cautious about unsolicited attachments. If you use Gmail, it scans every attachment that is delivered to your Inbox and blocks the infected file if it’s already in your Inbox.
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Always check the name of the file in the email before opening it on your computer or web browser.
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Never open an email or download anything that is sent to you by an unknown person/source. A lot of malware infections rely on persuading you to turn macros back on, so don’t do it!ĥ. Microsoft deliberately turned off auto-execution of macros by default many years ago as a security measure. Don’t enable macros in document attachments received via email. This will also help to reduce the boot-time process in Windows in addition to protecting your computer from future attacks on components of Adobe Reader or other PDF viewers.Ĥ. Disable any start up entry of PDF reader programs. Uncheck the box before “ Allow opening of non- PDF file attachments with external applications ".ģ. If you are using Adobe Reader, open the preferences and click “ Trust Manager" in the list of categories. Configure your PDF reader to not launch non-PDF file attachments with external applications. It is a good idea to use the latest version of Adobe Reader (or an alternative PDF reader of your choice), and to always keep it updated.Ģ. Example: If you are using Adobe Reader Open Adobe Reader and go to “Edit -> Preferences” or simply press “CTRL + K”. How Do You Protect Your System?ġ.Disable JavaScript on your PDF reader. The results from VirusTotal are not 100% accurate so you need to be cautious. One way to determine whether a PDF file you were sent is infected by a virus is by uploading the file to VirusTotal. How can I tell if a PDF file I was sent contains a Virus? This will enable the malicious PDF file to load. There are also instances where a malicious website could use JavaScript or applet to check if a PDF viewer plug-in exists in your browser.
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When opening the document using Acrobat Reader, the MS Word document opens and requests you to enable editing through a social engineering attack: This runs a Visual Basic for Applications macro, which downloads and runs the ransomware. In such cases, the PDF file has an attached document inside (usually MS Word document). When you do so you might see a message asking you to pay a huge ransom to access your files. The bad, ugly and notorious guys dupe you into opening and clicking the attachments, and "enable macros" or "enable editing". PDF file viruses are mainly spread through email or by drive-by downloads in malicious websites. It’s essential to know the weaknesses of the PDF viewers that you are using. If the PDF reader is not vulnerable (or its settings eliminate that vulnerability), then your system won’t be compromised by a PDF file containing malicious code.ĭifferent PDF viewers have different vulnerabilities. What is the Weak Point?įor a system to be compromised by a PDF file or any other document, then the viewer would need to have some vulnerabilities.
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It is also possible to open and view a PDF file on a web browser with a PDF plug-in.Ī PDF file can be created with images and text or one can make use of JavaScript code to enhance some properties in the document. In this day and age, there are other free programs that could be used to open PDF files: Nuance PDF Reader, Sumatra PDF, Foxit Reader et cetera. Adobe also created the Adobe Reader, a free program, which is used to open and read PDF files.
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The Portable Document Format (PDF) is an innovative idea that was created by Adobe Systems Incorporated.