PDF malware analysis — malicious · fe959ca3f4c08beb

MALICIOUS

PDF

4.1 KB

MD5: a2fa0a4f641fdbea387801ca44663b8f SHA-1: a557f67ce9ed55f7e7dd55b45f8ac5d50a1e8f0c SHA-256: fe959ca3f4c08beb7e87504b9cafcdf739530ee0cfbb41ccc23d4d52a93786ed

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF sample contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. A critical finding of CVE_2008_2992 suggests the exploitation of a known PDF vulnerability. The embedded JavaScript, particularly the deobfuscated 'numeric_charcode_stage_000.js', likely performs actions such as downloading and executing a second-stage payload. The obfuscation indicators and the use of eval() point towards malicious intent.

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` `2c5dfda208052f39a77f89e5681e4766e7050e6c4243153548e94c4bd192ad7c`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	20841 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` `ae442f1fb1f49284485d9958e3f7b83e5f8826a9bec5f342711f9043557a7ac7`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6132 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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