PDF malware analysis — malicious · 76b5aad2d70635d5

MALICIOUS

PDF

14.6 KB

MD5: b6ab7d8d59e923f7df348ba9adfbd9f6 SHA-1: c79762d065f14f166a70ac40a8390052a4c4a9aa SHA-256: 76b5aad2d70635d5b785567034b9740a75c44928f09a94e925d9cdfd7240bd63

168 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The file is a PDF containing an embedded XFA form and script payload, flagged by multiple heuristics and ClamAV as malicious. The embedded JavaScript appears to be obfuscated and truncated, but its presence within an XFA form strongly suggests it is used to exploit a PDF vulnerability for client execution, likely to download a second-stage payload. The ClamAV detections indicate it is a known exploit dropper.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

ClamAV: Pdf.Exploit.Dropped-78 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Dropped-78
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
Embedded script payload in PDF stream low PDF_EMBEDDED_SCRIPT_PAYLOAD

PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://www.xfa.org/schema/xfa-template/2.5/

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_pdf_script_00000329.bin` `a230cbe9079528a99608ae114f33091984d522f10a4f39bf3e2a0342f70864e9`	pdf-embedded-script	PDF raw stream script payload at offset 0x329	14234 bytes
Detection ClamAV: Pdf.Exploit.Agent-36809 Obfuscation or payload: unlikely

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