PDF malware analysis — malicious · a044ac95a4492ef0

MALICIOUS

PDF

80.5 KB

MD5: ec1ef34fb8e13119a10098505752e5fc SHA-1: 2fc716fb900cf2c2931b9cf838c815acc979d670 SHA-256: a044ac95a4492ef026f142410333338accc579a2b02228a746f69782957f0eac

188 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1566 Phishing T1566.002 Phishing: Spearphishing Attachment

The PDF was flagged by multiple high-confidence heuristics, including ML classification and ClamAV detection, indicating it is a malicious exploit document. The presence of an embedded script payload and the ClamAV detection of 'Pdf.Exploit.Dropped-93' strongly suggest that this PDF is designed to exploit vulnerabilities and download a secondary malicious payload. The embedded URLs, while not directly malicious, are related to PDF and XFA forms, which are common vectors for such exploits.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 6

ClamAV: Pdf.Exploit.Dropped-93 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Dropped-93
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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
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://ns.adobe.com/xdp/
- 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_00000374.bin` `a0381b877674dc6bce432a3af529988ac40ea6c32a35f07467fdcf60f50fd76a`	pdf-embedded-script	PDF decompressed stream script payload at offset 0x374	69336 bytes
Detection ClamAV: Pdf.Exploit.Dropped-93 Obfuscation or payload: unlikely

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