Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfa57b28760a5bdf…

MALICIOUS

PDF

5.4 KB
MD5: c35ff73ae598aecf8c26679db218939d SHA-1: 0ff894262fdfc53d43624ea81cb11e06c7b36cf5 SHA-256: bfa57b28760a5bdfffe3b0f8836a6b88ab4b2a9bbd1d2971daf8265fb04ae2ad
186 Risk Score

Malware Insights

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

The PDF document contains embedded JavaScript and exploits CVE-2014-0496, indicated by the app.addToolButton/removeToolButton heuristic. The ClamAV detection 'Pdf.Dropper.Agent-7217394-0' further confirms its malicious nature. The embedded JavaScript, although obfuscated, is likely responsible for downloading and executing a second-stage payload.

Heuristics 8

  • app.addToolButton/removeToolButton — CVE-2014-0496 critical CVE exact CVE_2014_0496
    PDF JavaScript combines app.addToolButton() and app.removeToolButton() with heap-spray shellcode markers — the public Adobe Reader/Acrobat ToolButton use-after-free exploit shape for CVE-2014-0496. (matched in decompressed stream)
  • ClamAV: Pdf.Dropper.Agent-7217394-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7217394-0
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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/xci/2.6/
    • http://www.xfa.org/schema/xfa-template/2.6/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0005_000.js
f9780b98f070a901cd57bc0b502067c01849efde27e0200133b375da03e44421		 pdf-javascript-stream PDF /JS object 5 at offset 0x168 4457 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 13 eval/decoder/string-building token(s).

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