PDF malware analysis — malicious · 37a685005fb5450d

MALICIOUS

PDF

4.0 KB

MD5: 9d920e85341dd12a6704c5c958d26aff SHA-1: 02e14054daa088c3714eec2099b229bc091052a6 SHA-256: 37a685005fb5450ddee18fab1c22ecc92d36af0e0d5de4a30266bd923c08092d

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File: User Execution: Malicious JavaScript T1071.001 Web Protocols: HTTP

The PDF file contains embedded JavaScript that is heavily obfuscated. Heuristics indicate the use of eval() and String.fromCharCode, along with a critical CVE-2008-2992 exploit targeting PDF viewers. The deobfuscated JavaScript, named 'numeric_charcode_stage_000.js', likely downloads and executes a second-stage payload. The presence of these indicators strongly suggests a malicious PDF designed for exploitation.

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` `2f4a486a359f9f4864ad1f1c9259dd7cd7ab9201fce9e3de40539a0de5d4e0bb`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	19819 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` `6946762e931c20b1d33d7583bbd0a3094d5b1a7e06d7468cf635cf2d8ee56d7b`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	5834 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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