McAfee identified Trojan:PDF/Dropper.YA in PDF file saved on my computer

I'm not sure about the McAfee behaviour, but hopefully it was just a glitch of some kind?
I've given some more thought to Adobe Acrobat and suggest that you uninstall or update asap.
Before you do that, please run the SecurityCheck tool, so we can see what other programs need updating/removing. 

•     Download SecurityCheck by glax24:
•     If SmartScreen blocks the file click on More info and then Run anyway.
•     Right-click  with your mouse on the Securitycheck.exe  and choose Run as administrator and allow it to proceed.
•     When the scan has finished, it will open a text file named SecurityCheck.txt.
•     Close the file and Copy and paste the contents in your next reply.
•    The file can be found in a folder located at C:\SecurityCheck

The FRST logs look clean, but would you please run another full ESET scan on all the drives, using the instructions I posted earlier.
Please report back on the results.

Hi Dennis,

Following is the log from SecurityCheck:

Please work through the SecurityCheck recommendations, which will make things more secure.
Also here is some information on your version of Acrobat.
Phishing-trojans are often document files that look legitimate, but can deliver harmful content.
Maybe the detections on the drives were files that have been present for a while now, rather than anything new?
In the log they show as F:\ drive.
-----------------------------------------------------------------------------
Please post the ESET results, when they are available.
Let's also run a scan with AdwCleaner.
Please download AdwCleaner.

• Close all open programs and browsers
• Right click on the icon and select Run as administrator
• Click Scan Now
• When the scan has finished AdwCleaner shows you all detected PUPs and adware.
• If any are found, select them and click Quarantine. (I would suggest that you do not select Pre-installed applications for now, or any other items you wish to keep.)
• AdwCleaner prompts you to save and close your work before continuing. Click Continue.
• After cleaning, you are prompted to restart your device. Click Restart now to complete the cleanup process.

Once your computer has restarted ...

•     If it doesn't open automatically, please start AdwCleaner.
•     Click on View Log File button (This log can also be found in the Log Files tab).
•     A Notepad file will open containing the results.
•     Click Skip Basic Repair (if the option appears)
•     Please post the contents of the file in your next reply.

Thank you, Dennis. I will follow your instructions and report back asap. The F drives are portable and usually not plugged into my computer. I will scan them and report the results after updating my software. I will also proved AdwCleaner log when I've completed the steps.

Hi Dennis,

I've attempted to update the software flagged by SecurityCheck; however, in running SecurityCheck to see if the updates are recognized, the software is still flagging them for update. Is this typical?

I've not heard about this, but will run some tests on the tool, when I have a moment.
The previous results aren't being cleared for some reason, by the sound of it.
However all should be well if you have applied the updates and you could always double check the program versions to be sure.
For example in Firefox you click on Help and then About Firefox. The latest version is 123.0.1.

I see that to have 2 versions of Firefox installed, so suggest that you remove this one.

Mozilla Firefox 85.0 (x64 en-US) (HKU\S-1-5-21-309238639-2357849422-1781197669-1001\...\Mozilla Firefox 85.0 (x64 en-US)) (Version: 85.0 - Mozilla)

Thanks, Dennis. I have proceeded to uninstall all of the programs that needed updating and I'm reinstalling them. I have to find a replacement for Creative Suite since the version I have was purchased as a full installation and now the applications I use are subscription and very costly.

I will be proceeding with the scans on the F drives and submit the results when I have them available.