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16 Aug 2007 No hard evidence that PDF spam exposes users to security risks, claims the company, which nonetheless recommends user caution.
Spammers have now resorted to attaching PDFs to emails to entice users to open the PDFs and read their ads. Very annoying, since almost all spam including a PDF is much larger in size than a normal email. At first, I wondered if a virus writer had been able to inject a PDF file with a virus and was infecting computers.
Spammers using common file formats as attachments for pump- and-dump scams. This white paper explains what makes spam such an unbearable problem and how spamming tactics are evolving daily to beat anti- spam software. In the space of two months, spammers have switched from image spam to using PDF, Excel
30 Sep 2015 We've recently encountered a number of malicious spam messages with PDFs attached. The PDFs themselves are not malicious as they don't contain executable code, but they do contain images with underlying URI actions. The image, if clicked, will open the
12 Jul 2007 Using security vulnerabilities in PDFs, this new attack could be significantly more malicious than image spam.
8 Jul 2010 Symantec detected a major spam attack using the PDF vector on July 1, 2010. The attack comprises a crafty message asking the recipient to confirm his or her phone number in a PDF file attachment disguised as a phone bill. The payload within the PDF is a Trojan that is detected by Symantec as Trojan.
8 May 2014 We are now seeing lots of infected malformed PDF attachments to emails. The bad guys are changing the method of malware delivery with these emails and attaching a genuine PDF file to the email instead of a zip. These PDFs are malformed and contain a script virus that will infect you if you open the PDF
26 Jan 2017 These deceitful PDF attachments are being used in email phishing attacks that attempt to steal your email credentials. Apparently, the heightened phishing activity that we have come to expect every year during the holiday season has not subsided. Unlike in other spam campaigns, the PDF attachments we
Using a PDF attachment in a spam message to fool the anti-spam detection methods. Spam originated with ordinary text, which can be easily scanned. Image spam came next, making it more difficult to detect; however, spam filters learned to recognize image spam patterns. In 2007, PDF spam followed image spam as yet
27 Jan 2017 "Unlike in other spam campaigns, the PDF attachments we are seeing in these phishing attacks do not contain malware or exploit code," blogged Alden Pornasdoro, Microsoft Malware Protection Center team member. "Instead, they rely on social engineering to lead you on to phishing pages, where you are

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March 2018