PDF malware analysis — malicious · 300ad8ff352b66f6

MALICIOUS

PDF

4.1 KB

MD5: e2f662e0cc2f1029d0c53898041dd86c SHA-1: 0efa8140604d2e9b06c278daafedb7fff07fae39 SHA-256: 300ad8ff352b66f673dacca2a8fd9783a3a1a8743cb56851f7f7a392782459dc

128 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.001 Malicious Link/URL: Malicious File

The PDF file contains embedded JavaScript that utilizes eval() and String.fromCharCode, indicative of obfuscation. The critical CVE-2008-2992 heuristic firing confirms the exploitation of this vulnerability via util.printf to decode and execute JavaScript. This JavaScript is likely responsible for downloading and executing a second-stage payload, as suggested by the extracted JavaScript files and the overall malicious verdict. The lack of readable document body text prevents a more specific determination of the lure.

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` `c4f89490c7c641aef8201b97ca1be71825942ccf1fca3883fcd493e63a03510a`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	20113 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` `703694cb2b4c141dbaea7623f7d09e354fcb19bfab252e603dc53d32f4c945e7`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	5941 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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