Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6fafe066be90916…

MALICIOUS

PDF

6.7 KB
MD5: b9c356ba82b0cb91c0d78c2374340776 SHA-1: fad955fe4a4b9ddc34f10be7fcf25ea0c5401436 SHA-256: a6fafe066be9091663b0c4c99bb0869463106f5d91533a5990749a563a990faa
94 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. The script is further obfuscated and decodes base-26 character pairs to reveal the malicious payload. This payload is designed to download and execute a second-stage artifact, indicated by the 'base26_stage_000.js' file. The primary attack vector is the exploitation of a known PDF vulnerability.

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
bcbf264ff3a6974f327eaf11149d49102e9202565885dc93e1b0fb692e2ac731		 pdf-javascript-stream PDF /JS object 3 at offset 0x409 15410 bytes
base26_stage_000.js
7a8c42a40885eed6155c7ee16972f554db4369dece580db1f582e60fedcdfd0e		 deobfuscated-js base26-decoded JavaScript (decompressed) at offset 0x60D 5865 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 44 eval/decoder/string-building token(s).

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