PDF malware analysis — malicious · 828455db06e9c9c2

MALICIOUS

PDF

4.4 KB

MD5: bafb0260b1ebcb5b60e3ce0aa6cc8749 SHA-1: 65ac6ade77676c4622368ed85c9cfeadae5a2161 SHA-256: 828455db06e9c9c27f5e2f1d3ba45225cbf1117b277ef57cce23a68d82fe2e8b

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/Script Execution T1204.002 Malicious Link/URL

The PDF file contains embedded JavaScript, which is executed using a known vulnerability (CVE-2008-2992). The JavaScript is obfuscated and uses eval() and String.fromCharCode() to decode and execute its payload. The primary function appears to be downloading and executing a second-stage payload, though the specific URL is not directly extractable from the provided evidence. The extracted JavaScript files are indicative of a malicious downloader.

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` `27058eefcc0a920a773d67b9989a455f512a98ea39cb7cf1e593cf2c9c119a91`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	22487 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` `ac0c1c797daae883296e3754e3cfbc874c57444cfa8b66180735747fdfa7c92e`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6611 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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