Malicious PDF — malware analysis report

Static analysis result for SHA-256 38f8934bca08f939…

MALICIOUS

PDF

6.8 KB
MD5: 3ed9a113388afd8c3128b937c9be5bc7 SHA-1: e3e98d5371728e3437300409e6a36e526c154cdc SHA-256: 38f8934bca08f939c90b2ec6fe5c574e61cfe460954413f3118179484b950a52
132 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that exploits CVE-2014-0496 using app.addToolButton/removeToolButton. This script is further obfuscated and appears to be a downloader for a second-stage payload. The critical heuristic firing for CVE-2014-0496 and the presence of obfuscated JavaScript strongly indicate a malicious intent to compromise the user's system.

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)
  • Suspicious extracted artifact high 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.
  • 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
  • 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
2c1a300d9a95db849f3765b99623a0ad010ad7ac392d35bc8ad62d85b791610f		 pdf-javascript-stream PDF /JS object 3 at offset 0x409 15514 bytes
base26_stage_000.js
d013394572a5c6836f889e80456b92e49f1a38a2a6f8dbcbba757f4270df05c8		 deobfuscated-js base26-decoded JavaScript (decompressed) at offset 0x60D 5907 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 45 eval/decoder/string-building token(s).

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