PDF malware analysis — malicious · 392e0ba0a76164c7

MALICIOUS

PDF

4.0 KB

MD5: 2f6d920de72f9d57943ce8fa75b31827 SHA-1: b4914ed6dd61e3ee7af0d8a98bd21e46dd78d3d8 SHA-256: 392e0ba0a76164c7926169f1879207aac6cf8741e228aa40cf335787fe8d72ee

216 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that utilizes `eval()` and `String.fromCharCode()` functions, indicative of obfuscation. The critical heuristic `CVE_2008_2992` specifically identifies the use of `util.printf` within a custom Base64 decoding layer, which is a known technique for exploiting Adobe Reader vulnerabilities. This JavaScript layer is designed to decode and execute further stages, strongly suggesting the PDF acts as a dropper for malicious code. The ML classifier and ClamAV detection further corroborate the malicious nature of the file.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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)
ClamAV: Pdf.Dropper.Agent-7250234-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7250234-0
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` `d9c1ea74012af8bf11e29a5a3136ba9c605f97b1f38f442d3458d67ac4f616aa`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6265 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` `49f0daf2fe930c06a528ee9f82a83797ec40aede6c33d8eda9f26b395ab0d490`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3545 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).
`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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