PDF malware analysis — malicious · ce1bec8731182b2a

MALICIOUS

PDF

3.9 KB

MD5: 8b5967e242c02c681fb86899147333e6 SHA-1: 6b4495be1c56c8bfd903876c868f0e7f32c7841b SHA-256: ce1bec8731182b2acc778b92bd3dc2fba2395f33202fb6e802c5ae2083f930df

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious JavaScript

The PDF document contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The presence of eval() and String.fromCharCode suggests obfuscated JavaScript code is being executed. Two JavaScript files were extracted, which likely contain the malicious logic. The primary function of this script appears to be downloading and executing a second-stage payload, a common technique for initial access.

Heuristics 5

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.
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `1443f1ea7b930a8035f6a40975cb23f618c167ef9a0ded0fd9cf8fb359764736`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x197	258 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111712_001.js` `18e5fdccd07c1cd76c1f11f42682873e1080ee729ccdaf5f7423b4b1abfa2a85`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x269	5465 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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