Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1bc19ac6acfe2b1…

MALICIOUS

PDF

100.5 KB
MD5: c6a957a6347da24cdc55e73488ebc7d7 SHA-1: 9d4180566882a8c5a5ab9ea52d9135d6ad211c34 SHA-256: a1bc19ac6acfe2b1f4e774269d182c88f911bd2dc1f6002e432bbe75334ef76e
180 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.002 Spearphishing Attachment

The PDF utilizes XFA forms and contains an embedded script payload, as indicated by multiple high and critical heuristic firings including ClamAV detection. The ML classifier also flagged this PDF with a very high probability of being malicious. While the embedded URLs are not directly malicious, the presence of an exploit and embedded script points to a delivery mechanism for a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • ClamAV: Pdf.Exploit.Agent-6136306-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-6136306-0
  • 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://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_pdf_script_00000246.bin
036d4cd00433767477d5494d2c584ac87ee1b05d39f0f3d020fdd33e55a169e5		 pdf-embedded-script PDF raw stream script payload at offset 0x246 102156 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36769
Obfuscation or payload: unlikely

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