PDF malware analysis — malicious · 60dc98cbde522ee6

MALICIOUS

PDF

4.1 KB

MD5: b5319fe19029a7c7ca5206abd5da79cb SHA-1: 9b494f8c40a65805d0aab2f202988dca498603ce SHA-256: 60dc98cbde522ee6aedaa0d55a83fc418c5c314b850039a5fddba8b19e802c0b

216 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF sample contains obfuscated JavaScript that utilizes eval() and String.fromCharCode() to execute exploit code, specifically targeting CVE-2008-2992. The deobfuscated JavaScript appears to be designed to download and execute a secondary payload, as indicated by the exploit cluster heuristic and the nature of the embedded scripts. The ML classifier strongly indicates maliciousness.

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` `f713dde63e06097588d1ca5031c93f7847ecbb55ed0e590929178d612e143afe`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	19788 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` `8bebd518ad6bf1aa225d2575bc4c549b8c796de245a59d92b0fff5496ea7bde6`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	5837 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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