Malicious PDF — malware analysis report

Static analysis result for SHA-256 567a9b41d508f6c3…

MALICIOUS

PDF

42.7 KB
MD5: 2c55e1d334f8d43c4f73d60425dad67c SHA-1: 3529f018eda53d45e7bce5df5aeba95fed0f77ab SHA-256: 567a9b41d508f6c37b0a26710fbb3df2745a1511e8d16adc3c2a485fa47439e5
188 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution T1566.002 Phishing: Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including critical detections from ClamAV (Pdf.Exploit.Agent-36830) and an ML classifier, indicating it contains an exploit. The presence of an embedded script payload and an embedded file further supports its malicious nature. The embedded URLs, while not directly malicious in reputation, are part of the document's structure. The primary attack pattern involves exploiting a vulnerability within the PDF reader to execute malicious code, likely downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • ClamAV: Pdf.Exploit.Agent-36830 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36830
  • 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/
    • http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin
a0dcc1bb0fe47df2fb55931aa633ed3f53aaa17424b44d6f34f773b2c639d91b		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42929 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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