PDF malware analysis — malicious · 296900d59de2f3e1

MALICIOUS

PDF

4.1 KB

MD5: df200a06e5351578b4fcf3e577ed8b8e SHA-1: 2c0e9eb46095c4a2742618743707abb31b96dc8d SHA-256: 296900d59de2f3e1e6d4c8c13ecf29ef922ea6d15a574fc4b886b3bf1a2021c0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF sample contains embedded JavaScript that utilizes eval() and String.fromCharCode, indicating obfuscation. The critical CVE_2008_2992 heuristic firing confirms the presence of an Adobe Reader exploit targeting util.printf. This exploit chain likely decodes and executes a malicious JavaScript payload, which is designed to download and run a second-stage payload. The ML classifier strongly indicates maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `9b98cf7df05c1d2ca17b4c2ad73a5d555006054e933deaae0b3e3574326442fe`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6369 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `4bbbeb93cf801e1fa91791c08668c0ce6038d8b26e7dd1d0baec200efb6976b8`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3623 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).
`custom_b64_stage_000.js` `1cb7e18540b20076c2125b66d91208aeace23917a51482a0f7cd2475d9d14fa0`	deobfuscated-js	custom Base64 decoded JavaScript layer 2 (PDF /JS object 13) at offset 0x95E	2013 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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