PDF malware analysis — malicious · 5d088b9de1e95964

MALICIOUS

PDF

4.3 KB

MD5: 6f003d60f0791ee1f3f876f57a6317f7 SHA-1: 19cac0471e1576140b70fdbc5a8fbf5b1cfcd28e SHA-256: 5d088b9de1e959642c0627bd63d5ff36895c4bd6223855333a5a8b4d08ac56a4

216 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains embedded JavaScript that utilizes the `eval()` function and `String.fromCharCode()` to construct and execute exploit code targeting CVE-2008-2992. The deobfuscated JavaScript indicates a pattern of generating and sorting arrays, likely as part of the exploit chain to trigger the vulnerability and download a subsequent payload. The ML classifier strongly indicates malicious intent.

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` `b91758d35004351229343134376ee80242c17a7e7e25ee01e0dc237c9c2b214b`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	22254 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` `543d117aba4975a6977a986a2621232f0afd5fb8caec8c90f775f854c60f5800`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6543 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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