PDF malware analysis — malicious · f2868dc87a9f3178

MALICIOUS

PDF

4.1 KB

MD5: 365a54d0265fce7c5845740ad660de0c SHA-1: 2a1bd79a31b6c630d918c7debda7f7853047ed4e SHA-256: f2868dc87a9f3178f7e8b14a74b483b13e2b6935710f7e7ec943f5d24a174f30

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1059.007 JavaScript

The PDF file contains embedded JavaScript that utilizes the `eval()` function and `String.fromCharCode()` in conjunction with a custom Base64 decoder. This technique is used to deobfuscate and execute a malicious payload, specifically targeting the CVE-2008-2992 vulnerability in Adobe Reader. The ML classifier strongly indicates malicious intent, and the deobfuscated JavaScript layers confirm the exploit execution.

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` `11922f28c735fdfc3b3580c7c5bf73dc0c930c9ebe771f4c918dbc4e7d1ed9fd`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6417 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` `5a87dc9795fdb770c37ffab251ed14acf035ffae5eb602f0c819651ab9902340`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3660 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`custom_b64_stage_000.js` `85fe71200c33f398824631ccde606ec4fbbce8035fb8611c145accabab2137e1`	deobfuscated-js	custom Base64 decoded JavaScript layer 2 (PDF /JS object 13) at offset 0x95E	2025 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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