PDF malware analysis — malicious · 9f1f561014f6a9b6

MALICIOUS

PDF

4.0 KB

MD5: 2b20b35c84708c70b2282d5b13e91c56 SHA-1: 29600c17c619f74f3a1720236f63f2b0211038d5 SHA-256: 9f1f561014f6a9b63bd5d051c86cac9b0e73aa3154405fce1c51246d29d9a96d

128 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, which is heavily obfuscated and utilizes `eval()` and `String.fromCharCode()`. The critical heuristic firing indicates exploitation of CVE-2008-2992, which involves a specific method of decoding and executing JavaScript. This suggests the script is designed to download and execute a secondary payload. The extracted JavaScript files confirm the presence of obfuscated code and the use of `util.printf` for decoding, consistent with this exploit.

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` `df0af3bddfd2c23b86d589004c46878e61fa1bf851ce7eb1cd5ae1d9cb91faad`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	20347 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` `b3b5753682883e1f4a47703d5c38038f9471fd472ab9071a7e2783f794585edc`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6019 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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