PDF malware analysis — malicious · b2dbbb5cbfb38653

MALICIOUS

PDF

14.6 KB

MD5: c9239c976ac1f489cef420babd8002a5 SHA-1: b17375dc0af3e8ba308af32f5b2ed2afce95727a SHA-256: b2dbbb5cbfb386530dbe5b4fcd91741f156f73f8d9f0bb2baa4be97e8b209356

178 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell

The PDF file contains an embedded script payload, flagged by multiple high-confidence heuristics including ML and ClamAV detections. The embedded script is likely responsible for downloading and executing a second-stage payload, as indicated by the 'Pdf.Exploit.Dropped-78' and 'Pdf.Exploit.Agent-36809' ClamAV signatures. The presence of an embedded URL further supports the delivery mechanism.

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` `2ed342ab9e8d3f448fef7b0ee88e9818ba2ea2a93470b9f1918f23a26da6f82a`	pdf-embedded-script	PDF raw stream script payload at offset 0x329	14248 bytes
Detection ClamAV: Pdf.Exploit.Agent-36809 Obfuscation or payload: unlikely

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