PDF malware analysis — malicious · 9490164f7dca7fd5

MALICIOUS

PDF

4.0 KB

MD5: 22d884f39b92f893cf589d361d5f335e SHA-1: ac0a9a4a3808b9d2789b53b31c59efedd3351ef0 SHA-256: 9490164f7dca7fd5c172feb11f07db30dada179a88e8794aafb76f194a420acf

158 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1027 Obfuscated Files or Information T1071.001 Web Protocols

The PDF file contains embedded JavaScript that utilizes a custom Base64 decoder and `eval()` to execute an exploit. The `CVE_2008_2992` heuristic specifically identifies the use of `util.printf` within the JavaScript, indicating an attempt to exploit this known vulnerability in Adobe Reader. The script is heavily obfuscated, suggesting an effort to evade detection. The primary goal appears to be the execution of arbitrary code via the exploit.

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` `8cb1c76dbd7edbfe676d7a6cc94728d905af6595c87fbebeb8782905bcd4df06`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6293 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` `9a936d5316cfb3dc028cadd36bb0ab461e489929fbb4cbf7e21f1c5025d0bd77`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3567 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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