PDF malware analysis — malicious · d827b57b89fad153

MALICIOUS

PDF

4.3 KB

MD5: 98afb992115ce3fee7cc1b2b7ad5fd3a SHA-1: eba51c907120a4e3a25f1c4f045b38a6e237e517 SHA-256: d827b57b89fad1530ff959ca97a2be97bdb529b5b29d76e37cd3d48438dd580e

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious JavaScript

The PDF file contains embedded JavaScript that utilizes eval() and String.fromCharCode, indicating obfuscated code execution. A critical heuristic identified the CVE-2008-2992 exploit, which leverages util.printf to decode and execute JavaScript. This suggests the primary function of the PDF is to exploit this vulnerability to run arbitrary code, likely for downloading further malicious content.

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` `313a059da4e0af4551441ab4c1f2d49968a5e2353922d55b157fadfa460df8a0`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	23700 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` `65504202bff45264df095df4c1fbcdd0de7ddde1b86766fdb8cfea94094f4c7f`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6979 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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