PDF malware analysis — malicious · 3bf2a1f464427477

MALICIOUS

PDF

4.4 KB

MD5: 77aeffa263d0f0799e3f9590546f4976 SHA-1: 5c5870688b708bf6b68400b1ea7333157c9a4265 SHA-256: 3bf2a1f4644274779e4cacc8a630a05de4beb86d52aebeed141450ab2b82a5ed

176 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. Specifically, the CVE-2008-2992 exploit is present, which leverages `util.printf` and `String.fromCharCode` to decode and execute JavaScript. This script is designed to download and execute a second-stage payload. The deobfuscated JavaScript is contained within `numeric_charcode_stage_000.js`.

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)
Suspicious extracted artifact high 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.
String.fromCharCode medium PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically (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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `d7d8b0a559c58936dfbb0f09ed50a4a126a5de52200f7158edd9d60d3245b2f3`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	23268 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` `712fcb25c0aaae2cd65ebb5c19ff43ad9c95c2235b71c91a186cf3a7c6c7ae0a`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6823 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

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