PDF malware analysis — malicious · cc04e4b7e12e3e00

MALICIOUS

PDF

4.4 KB

MD5: e635bb732022013691da57db0856c8a2 SHA-1: 489e11ae978dfec7c7eed15106b5f0fcf9f218c0 SHA-256: cc04e4b7e12e3e000e73ca13537367eed7f30819a831c3e4f1294e0ea7a64337

128 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, including a critical CVE-2008-2992 exploit that uses `util.printf` to decode and execute a string. This JavaScript is further obfuscated and likely downloads and executes a second-stage payload. The presence of `eval()` and `String.fromCharCode` calls within the JavaScript streams indicates dynamic code execution. The extracted file names 'javascript_obj0005_000.js' and 'numeric_charcode_stage_000.js' suggest stages of obfuscated code.

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` `ea045360b89594eade9ee7aaa9b8b51dd2fd41b214ff4fd3da7093e6d97359cb`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	22749 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` `d261ac16760bc898b4b22720919c9dcb96837ba9421637ca199c4d631de4ee2b`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6691 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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