Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b9939caeecbfa3…

MALICIOUS

PDF

42.8 KB
MD5: 24c6c5f88b7c36cf5694d16b8a2ed994 SHA-1: 79045222ebe4aa1f99642fbf8f2521d623ba323c SHA-256: 88b9939caeecbfa35b16831cde68df2e28d971d4096bd3adddb76be81200c5da
188 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.002 Spearphishing Attachment T1059.001 PowerShell

The file is a PDF identified as malicious by ML classifiers and ClamAV with the signature 'Pdf.Exploit.Agent-36830'. It contains an embedded script payload and an embedded file, indicating it's designed to deliver further malicious content. The presence of XFA form elements and embedded scripts suggests an exploit attempt, likely to download and execute 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
5533b7caead1592a37664782165e6cd2f2f727457af90f337c1c34669afc5222		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 43096 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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