PDF malware analysis — malicious · 8595a09a649bac6e

MALICIOUS

PDF

4.3 KB

MD5: e1d898bd1e2cc17aa0b7c7b58aed40d1 SHA-1: 67811b348881fc164afaf65c184e90a2c7672312 SHA-256: 8595a09a649bac6e8181823fe29d764af4ff346afad9869f5da319621ac0ccca

128 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.001 Malicious Link/Object

The PDF file contains embedded JavaScript that is heavily obfuscated. Critical heuristics indicate the use of eval() and String.fromCharCode, along with a specific CVE-2008-2992 exploit pattern involving util.printf. This JavaScript is designed to decode and execute a further stage, likely a malicious payload, from the embedded streams. The extracted file names 'javascript_obj0005_000.js' and 'numeric_charcode_stage_000.js' suggest stages of this execution chain.

Heuristics 6

util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992

PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (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.
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_obj0005_000.js` `2a223f73fd208ba2424f9b16c18e1c62f36682632444ac873c8338b955b61391`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	22405 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`numeric_charcode_stage_000.js` `d58d4b88f4b587ac7e3337ce838d7f498f88f699b76e799e93c87cc7b4f1a1cf`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6587 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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