PDF malware analysis — malicious · b5131dfcd8a1e5b9

MALICIOUS

PDF

14.6 KB

MD5: f0e2cab6a71e9e281e611fb7ce922204 SHA-1: 2823405412cbda8fee39ef8e5a1c8e863fe1a03a SHA-256: b5131dfcd8a1e5b9d532a67cee6363bdff22e0abde20ecc34364bf48aa1d7084

178 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution: Malicious PDF T1566.001 Phishing: Spearphishing Attachment

This PDF file was flagged as malicious by multiple engines, including ClamAV, which identified it as Pdf.Exploit.Dropped-78 and Pdf.Exploit.Agent-36809. The presence of an XFA form and an embedded script payload indicates a likely exploit attempt. The embedded script is responsible for downloading and executing a second-stage payload, as suggested by the ClamAV detection names. The embedded URL, while seemingly benign, is part of the malicious document's 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` `39fbbd1c8b3c63d4f8bc51bc52277014f8d812f6bf09871c7ffcd83543995b41`	pdf-embedded-script	PDF raw stream script payload at offset 0x329	14244 bytes
Detection ClamAV: Pdf.Exploit.Agent-36809 Obfuscation or payload: unlikely

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