PDF malware analysis — malicious · d812a39fd03f4bdd

MALICIOUS

PDF

4.1 KB

MD5: af9ade4e9a0fd6956632ccd6c211a011 SHA-1: 2b1cdcf47fa3e9a535366ba350ff2e730c975ec3 SHA-256: d812a39fd03f4bdd89f127bc2e4cd7438ee1b95c664238c8548d57654c627d59

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript that utilizes `eval()` and `String.fromCharCode()`, indicating an attempt to obfuscate malicious code. The critical finding of CVE_2008_2992 suggests the exploitation of a known PDF vulnerability. The deobfuscated JavaScript, `numeric_charcode_stage_000.js`, likely serves as a downloader for further malicious activity. The file's structure and heuristic firings strongly suggest it's designed to deliver a secondary payload.

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` `63326dec40aacc22d5e971f056476002909a5e49dcddf15160ced71fdbd02618`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	20196 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` `5379d7fd3da14c6aa0bbb7280164c16ee191b7b169bfad6d53b9bf412d274fcc`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	5971 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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