PDF malware analysis — malicious · c08421d15b3738b8

MALICIOUS

PDF

18.6 KB

MD5: 39c316c89610a91a6514913b85c6d4b5 SHA-1: bcfd65cfec751a8013cf5675d528040e06a9dbe7 SHA-256: c08421d15b3738b86262d8573f7cdad1cb9ba482bb62f68bcc7c68a22e01ead4

178 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution: Malicious File T1566.002 Phishing: Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a critical ClamAV detection (Pdf.Exploit.Dropped-78) and an ML classifier indicating high maliciousness. The presence of an embedded script payload within an XFA form suggests an exploit is being leveraged to execute malicious code. The embedded URL, while seemingly benign, is present within the document structure.

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` `46a8e175f9b8d4f8e7a3febb2cd0d45435c879a9f0a0b3b3b504071decf8d13e`	pdf-embedded-script	PDF raw stream script payload at offset 0x329	18306 bytes
Detection ClamAV: Pdf.Exploit.Agent-36809 Obfuscation or payload: unlikely

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