Malicious PDF — malware analysis report

Static analysis result for SHA-256 67a4c31ac7aa9f45…

MALICIOUS

PDF

22.8 KB
MD5: adc6a43fb29f2c9fb68580a8270619f7 SHA-1: 3e347b14f4ce29073f5dd5a5c920ab1954b313e6 SHA-256: 67a4c31ac7aa9f4586f2d7b1fb79f08d50b97bf4580ce1d345c1b4915f2750e9
198 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF sample contains XFA forms and embedded JavaScript, flagged by multiple high-severity heuristics including PDF_EVAL and PDF_XFA_SCRIPT. The embedded JavaScript is likely responsible for executing a malicious payload, as indicated by the ML classifier and ClamAV detection (Pdf.Exploit.Dropped-78). The presence of an embedded file further supports the theory that this PDF acts as a dropper for additional malware.

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 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.
  • 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
36933de51c54bbf43572d23051c99ad95283abf418e12db5a759caf4df84926a		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 22585 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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