Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3d4b9ecd5f8d34c…

MALICIOUS

PDF

6.7 KB
MD5: 8bc4b5c36a337cd9c49fa5dfeae284e0 SHA-1: e7307c32b0c129a956e0703cc62b149e44a83d09 SHA-256: c3d4b9ecd5f8d34c387b9de4edd9b6a2f37e179dc94bd58051942aba2e47254b
94 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that exploits CVE-2014-0496 via app.addToolButton/removeToolButton. The JavaScript is further obfuscated and decoded using a base26-like scheme. This technique is commonly used to download and execute a second-stage payload. The presence of XFA form elements and AcroForm buttons with actions further indicates a malicious intent to trigger script execution.

Heuristics 7

  • 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. (identified after JavaScript deobfuscation)
  • 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
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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/2.8/
    • http://www.xfa.org/schema/xfa-template/2.5/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0003_000.js
0411764467131fe962887604a6e733a952f31f4b2576234bc17a076b36c7fd55		 pdf-javascript-stream PDF /JS object 3 at offset 0x409 15424 bytes
base26_stage_000.js
7ba635c4946b1d4842598b1b4904fd5a718779bb5c1fb26a3f45eb4458633d7d		 deobfuscated-js base26-decoded JavaScript (decompressed) at offset 0x60D 5871 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 44 eval/decoder/string-building token(s).

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