PDF malware analysis — malicious · 43cbde8bb4a76e32

MALICIOUS

PDF

18.3 KB

MD5: 0a490164a7d666ca478b525dfdeecfe5 SHA-1: 4535a18acbd0f0e7161314da6c0174e9c96dc6b4 SHA-256: 43cbde8bb4a76e32ed3eafc41ea9bc6e6bc4f356bf5c5d99ca6e1b7281a761ce

178 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution: Malicious PDF T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains an embedded script payload, as indicated by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' heuristic and confirmed by ClamAV detections ('Pdf.Exploit.Dropped-78', 'Pdf.Exploit.Agent-36809'). The ML classifier also strongly flagged this PDF as malicious. The embedded script is likely responsible for downloading and executing a second-stage payload. The presence of an embedded URL, though not directly malicious in reputation, is consistent with a 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` `e27fa80fe0f69b6a62698d6a0570105502ef6654e35580f7cb53dd3b4ce07a28`	pdf-embedded-script	PDF raw stream script payload at offset 0x329	18039 bytes
Detection ClamAV: Pdf.Exploit.Agent-36809 Obfuscation or payload: unlikely

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