Out of curiosity, I checked all the links and couldn't find any proof, it seems as thought more than half the articles promote some kind of AV software.
Let the Lemmings fall for it seems to be their credo.
Again:
The only anti-virus you need to protect your Mac is education and common sense.
Please, please use it and don't quote some greek philosopher from two thousand years ago, not hundreds. Maybe the Indians knew about him though.
Here are 7 places to read about the virus/malware concerns we should have for the Apple computer community. They are the real deal. To not at least take precautions like the PC world has been doing for years would put a Mac computer at risk. I am not wanting to play a game with the ones who have taken issue with my posting concerning Mac virus/malware, just trying to say a word to the wise is sufficient. Better to take note now than after you get hit by one of these conditions.
http://clickpcrx.blogspot.com/2011/01/top-5-malware-for-mac-os-x.html
Trojan.OSX.Jahlav.A& Trojan.OSX.Jahlav.A The Fake Codec
The OSX.Jahlav family has been discovered in November 2008, when it started to be distributed as a fake codec. In order to lure users into downloading and installed the malicious DMG (Disk Image) file, the gang behind this scheme created a page claiming to feature an unplayable video. If the user installs this alleged codec, the malicious payload starts downloading additional Trojans from a remote web server.
... not a virus, but a trojan, the user has to install him- or herself.
Trojan.OSX.RSPlug.A Porn may get you phished even on a Mac
This is one of the most dangerous families of malware running on Mac OS X. The RSPlug Trojan also plays the missing codec card in order to persuade the user into downloading and installing the infected DMG. It is present particularly on websites with pornographic content. Once installed, the Trojan tampers with the DNS server entries in order to redirect traffic from legit addresses to copycat, spoofed domains set up by phishers to collect critical information about e-banking accounts, email and the like.
... not a virus, but a trojan, the user has to install him- or herself.
Trojan.OSX.OpinionSpy.A Mac Screensavers reporting to the base
The OpinionSpy family of spyware is usually installed by a number of freely-distributed applications such as screen-savers and audio / video converters. The installer utility of these applications will fetch the spyware package, install it and run is with root privileges. Trojan.OSX.OpinionSpy.A poses as a marketing research tool, but it does more than collecting users browsing habits and preferences: it also opens backdoors and shuffles through a great number of documents found on both local and remote drives. The Trojan poses a great danger to the users privacy and to the security of the stored data.
... not a virus, but a trojan, the user has to install him- or herself.
Trojan.OSX.Boonana.A The Social Network Worm
Trojan.OSX.Boonana.A is a multi-platform e-threat that can run on Windows, Mac OS X and Linux altogether. This Java-based piece of malware downloads a couple of malicious files in the users home folder in an invisible folder called .jnana, then installs a local IRC- and web server, among others. The Boonana piece of malware will also attempt to change the DNS server settings in order to hijack requests to legit websites towards spoofed websites as part of an extremely efficient phishing scheme.
... the culprit is Java. Again, common sense might help.
Intego, a Mac security software company, issued an alert Wednesday warning Mac users of the OSX.RSPlug.A malware, which it describes as a Trojan horse. Those of you familiar with mythology recognize the reference, and OSX.RSPlug.A disguises itself as a video codec that would ensure whatever porn video you just stumbled upon will play on your Mac.
... not a virus, but a trojan, the user has to install him- or herself.
proper link to the PDF:
http://www.macforensicslab.com/Malware_on_Mac_OS_X.pdf
Aha, it talks about the possibility of viruses hiding in packages, but where are those again? Lost?
Not really any proof by the author of what viruses exist. It seems more like some advertisement for the AV software titles.
Have you read the thread yet?
Have you read that thread yet? Till the end on page 2?
http://www.macforensicslab.com/Malware_on_Mac_OS_X.pdf
This is the same PDF you almost linked to in your third link.