Malicious PDF — malware analysis report

Static analysis result for SHA-256 71fdd75dd7740a7b…

MALICIOUS

PDF

42.7 KB
MD5: 7eed405080047199da25faa56abf99bd SHA-1: 3496b83420a904e605c7b9af702ee536bb5e6c21 SHA-256: 71fdd75dd7740a7ba4e460ed9a73c2c8f4092c3d0875b6f6245aa40152e48edc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was flagged as malicious by multiple heuristics, including ML and ClamAV, indicating it contains an exploit. The presence of an embedded script payload and an embedded file suggests it is designed to download and execute a second-stage payload. The embedded script, while obfuscated, appears to be JavaScript, likely responsible for triggering the exploit and handling the 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 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 script payload in PDF stream low 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 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
4adbedd16767d58b1a948bb526316951a31eecfe53023f977f11e417d76cd8c2		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 42954 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36830
Obfuscation or payload: unlikely

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