PDF malware analysis — malicious · 239e1cecf933532d

MALICIOUS

PDF

3.8 KB

MD5: b8ef371d998cb71d8b485ea60c4be033 SHA-1: cd77bd99f608b0601b6baf548ff60d14459e4977 SHA-256: 239e1cecf933532d4fe5d4800d9b4b1d3cd45ddb61a3ad5f6018f3445cc90555

134 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious File

The PDF sample contains embedded JavaScript that leverages the CVE-2014-0496 vulnerability by using app.addToolButton/removeToolButton with a decoded numeric character-code string. This technique is used to execute arbitrary JavaScript, which is a common method for downloading and executing further malicious payloads. The presence of eval() and String.fromCharCode() further supports the malicious intent of the script. No specific malware family could be confidently 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)
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (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
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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.

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `fe67e5f7090181865b8070ba4143678f5e9016c0909907352d8d4545eeea92a4`	pdf-javascript-stream	PDF /JS object 6 at offset 0x224	19105 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`stream_000_off0000012f.bin` `69d0d0114b03e3f7748b6bbd5809c83dc8d156e20d1bfcdf9d5925fb9a502f54`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x12F	372 bytes
`numeric_charcode_stage_000.js` `bf4dbc74ca57dc45c4bef9d1beffc7ddc3e9ee651d4b47ee15e9bf60ba595dc0`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x232	5652 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 13 eval/decoder/string-building token(s).

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