PDF malware analysis — malicious · cb8f3042a08493aa

MALICIOUS

PDF

4.2 KB

MD5: b8471a938ea82882ce75769d1adc0cf4 SHA-1: e9db8b6ddf1e91c1b43cb7edd547314d78231936 SHA-256: cb8f3042a08493aa4b9fb37685af5a32a9823453176a9f8fb774967b8e9b7c1b

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. A critical finding is the CVE-2008-2992 exploit, which leverages `util.printf` to decode and execute JavaScript. This script is designed to download and execute a second-stage payload, as suggested by the presence of deobfuscated JavaScript files and the nature of the exploit.

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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `6f2048e235c92db0c5c515653b5e604b1070a3a30fe18c1f59457d44153d6f09`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	22375 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`numeric_charcode_stage_000.js` `0a656d66987f6292b79328f040a2cfd4c419338f8c97e41eb7a4bc384ad28145`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6588 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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