PDF malware analysis — malicious · 8cb4de3821b17491

MALICIOUS

PDF

14.7 KB

MD5: c4fe23d75609a11c65b52a64447377f2 SHA-1: 9f67a2bbca6cd029e38dade1f6b4b88ea925c26d SHA-256: 8cb4de3821b1749144dd69c3bfc55a02458612bcb3f99b7444e12183d12dbfdf

178 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file was flagged by multiple high-confidence heuristics, including ML classification and ClamAV detections indicating it is a malicious exploit. The presence of an embedded script payload within a PDF stream strongly suggests it is designed to execute malicious code upon opening. The embedded URL, while seemingly benign, is likely 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.
Embedded script payload in PDF stream medium 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.
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
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` `3b7776f7acaf76adcf1c2a2fe2fcffc83dd6cc6acf36f5b51b2365136861c3a4`	pdf-embedded-script	PDF raw stream script payload at offset 0x329	14366 bytes
Detection ClamAV: Pdf.Exploit.Agent-36809 Obfuscation or payload: unlikely

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