PDF malware analysis — malicious · 5f2bc3747205f128

MALICIOUS

PDF

14.7 KB

MD5: a11c3f144e994d2f572c91adc3fa2cd9 SHA-1: 6b8997245f2f4745593c4dfef07d45291ee3e977 SHA-256: 5f2bc3747205f128253686b075987057c3e256022f97acd1434bb17a47f133d2

168 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as Pdf.Exploit.Dropped-78 and an extracted artifact as Pdf.Exploit.Agent-36809. The presence of an XFA form and an embedded JavaScript payload indicates an exploit designed to execute arbitrary code. The script itself is heavily obfuscated but appears to be part of the exploit chain.

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` `6333895e066234dfaf6bfa68775da178cbfa5440f6e212cc0d114e29d703d7ff`	pdf-embedded-script	PDF raw stream script payload at offset 0x329	14361 bytes
Detection ClamAV: Pdf.Exploit.Agent-36809 Obfuscation or payload: unlikely

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