PDF malware analysis — malicious · 0f4d1137c6f59891

MALICIOUS

PDF

4.6 KB

MD5: a02e4fae444de987b13d9eda4d59a235 SHA-1: 4234751025ac62428c0d079dec8cb048373ed170 SHA-256: 0f4d1137c6f59891fc165ecfaca2c138f1d9fa15264c41a83728aa51577a0052

216 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file contains embedded JavaScript that leverages the CVE-2008-2992 vulnerability in Adobe Reader. The JavaScript is heavily obfuscated using character codes and `String.fromCharCode`, but the `eval()` function is used to execute the deobfuscated code. This exploit cluster is designed to achieve arbitrary code execution on the victim's machine.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 7

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)
PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
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` `ccfc485277ac7f8723021b2cc4511002ef74be371b6a60bbf52abaf34e3dccfa`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	24491 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` `498f62d70a82b4f45342c6f2863f1b0e9a3ff03e5da7c94e16854935b515fdaf`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	7231 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

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