Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b9b2f4fea480046…

MALICIOUS

PDF

42.4 KB
MD5: 4e9b807c394df4e34290ad43d635fe74 SHA-1: d6e931dc0ea0a981d1c59d0190a25c944e7d3c58 SHA-256: 7b9b2f4fea4800467ce26b6e12406fd6b9b0f07dcf93eae2f1e88c223c43d8fd
156 Risk Score

Malware Insights

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

The critical ClamAV detection 'Pdf.Exploit.Agent-36830' indicates this PDF exploits known vulnerabilities. The presence of an embedded script payload and an embedded file further supports this. The document body contains obfuscated JavaScript, likely intended to download and execute a second-stage payload, though its exact function is obscured. The embedded URLs are related to XFA forms, a common vector for PDF exploits.

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
2d92c094acd22be79740ef275c913cf9e43043406b31b5a9f6a25a11c8ef0b5d		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42642 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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