Malicious PDF — malware analysis report

Static analysis result for SHA-256 20e5efd7d9f39f29…

MALICIOUS

PDF

22.9 KB
MD5: d94cbbd41e74996398af4438b2f4dddd SHA-1: e4de1c04cde94f6e506de63402c7bfc9fb2a0614 SHA-256: 20e5efd7d9f39f294c6503b2577f84340b60a36c9b3f744901fb5aa51eb19566
208 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File

The PDF contains XFA forms with executable scripts, flagged by multiple high-severity heuristics including PDF_EVAL and PDF_XFA_SCRIPT. ClamAV also detected it as Pdf.Exploit.Dropped-78. An embedded file, 'embedded_file_obj0008.bin', was also extracted, suggesting it acts as a dropper for a secondary payload. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 8

  • XFA form contains risky executable script high CVE related PDF_XFA_SCRIPT
    PDF embeds an XFA form whose script block contains exploit, submission/launch, or shell-execution primitives. Ordinary LiveCycle print/update scripts are left as generic XFA/JS signals unless stronger behavior is present.
  • ClamAV: Pdf.Exploit.Dropped-78 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-78
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution
  • 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
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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
f8786f0eb9511d148edc8e56d665bcb247e72f6026d4710844f6e3e38193d0b8		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 22652 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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