PDF malware analysis — malicious · 8026e1df9c3d053f

MALICIOUS

PDF

4.4 KB

MD5: 1d9dc6d845189e52bf94bd324ea736f1 SHA-1: 10409835b963ed02ee6c69486a45c56c92fa4b23 SHA-256: 8026e1df9c3d053fd977d1668b0d1fc8e3fe2acb7bbfc1001c0d090d519409b6

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF sample contains embedded JavaScript, which is heavily obfuscated and utilizes eval() and String.fromCharCode(). A critical heuristic identified the CVE-2008-2992 exploit, which leverages util.printf to decode a numeric character-code string and execute it. This indicates the document is designed to exploit this vulnerability to run malicious code, likely a downloader for further stages.

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` `e91f736d41431b38b126a26bcf1bd6e7231ed57faa129b731df40021673440fd`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	23785 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` `1a24d2f75b95957be87fe169e785d22918525714d27ebfe7bac7bdfa0cdcedb0`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6982 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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