PDF malware analysis — malicious · 59147b226bf0e843

MALICIOUS

PDF

4.0 KB

MD5: e2ac9ce0faaccb7663e6621db1acd6cc SHA-1: 82737831db120ed2a49380f5f621de2a02b0a265 SHA-256: 59147b226bf0e8430df8505efcbd51d5ca37773369560f0b8b0bff7191815135

158 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, indicative of obfuscation. A critical heuristic identified the CVE-2008-2992 exploit, which leverages util.printf to execute a custom Base64 decoded JavaScript layer. This layer likely downloads and executes a second-stage payload, a common technique for initial access.

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` `b085d660490562ed475a45939cbf4360cc0f84815f4fad9b865a327ae40c3544`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6341 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` `94108302b8ae4e0136ab8f9813bfa603b41111c66be4e23ef7f405eea8f9e4be`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3603 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).
`custom_b64_stage_000.js` `bd739c690122d6ba0212010b117da819c33dd986aec379cc5d42c433bfd06e99`	deobfuscated-js	custom Base64 decoded JavaScript layer 2 (PDF /JS object 13) at offset 0x95E	2019 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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