Malicious PDF — malware analysis report

Static analysis result for SHA-256 4350c1151b105e00…

MALICIOUS

PDF

6.7 KB
MD5: 5d3b3369a5b32a5be21cdb559b2e4ece SHA-1: a36e6405a797f5c1f5622e6aad809d2d302cb5ff SHA-256: 4350c1151b105e00cb327b94d0f9a1d0b72ab6068d038c5c7b24070eef47ab40
132 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript T1204.002 Malicious File Execution: User Execution: Malicious File

The PDF sample contains embedded JavaScript that exploits CVE-2014-0496 using app.addToolButton/removeToolButton. The JavaScript is further obfuscated and decodes a base26-encoded stage, which is then likely executed. This indicates the document's primary purpose is to download and run a malicious second-stage payload. No specific family could be identified.

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
fafb55ef6653ca627d1c0003831d26ef0597acec7fac66283e62d22bacdfdec6		 pdf-javascript-stream PDF /JS object 3 at offset 0x409 15484 bytes
base26_stage_000.js
f56fcc1eeea4dcf013be7c8d0adfe2994f5f53559a84309b7397d46efc4eac5b		 deobfuscated-js base26-decoded JavaScript (decompressed) at offset 0x60D 5895 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 45 eval/decoder/string-building token(s).

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