Malicious PDF — malware analysis report

Static analysis result for SHA-256 e860bf4f8159178e…

MALICIOUS

PDF

42.4 KB
MD5: e5b0863efb74087e4dc3a5bfb53849c7 SHA-1: d5d1f98b89bdad435b98a7f1a4644955ace060c7 SHA-256: e860bf4f8159178e118ccf85369c068d8df17fe266ede79b89db7a9fd49b53bd
188 Risk Score

Malware Insights

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

The PDF was flagged by multiple high-confidence heuristics, including ML classification and ClamAV detection (Pdf.Exploit.Agent-36830), indicating it contains an exploit. The presence of an embedded script payload and an embedded file further supports its malicious nature. While the document body and script content are heavily obfuscated, the overall pattern suggests an exploit delivery mechanism, likely aiming to download and execute a secondary 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
0ccca643ebdaebbe8002bd4e23cb546295777127d9d9f822fcef2cbb98c80914		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42656 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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