PDF malware analysis — malicious · 58fed90fa719de4c

MALICIOUS

PDF

4.4 KB

MD5: f86c3c0ece39a0e4cf61fee4e13a7207 SHA-1: dd53b7924a0598c3ca1f3c85d006f8ea899d2986 SHA-256: 58fed90fa719de4ca727ac188ed9d39bac284dc56e2fa0d2d39014c14e241a63

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File: User Execution

The PDF file contains embedded JavaScript, which is heavily obfuscated and utilizes `eval()` and `String.fromCharCode()`. A critical heuristic identified the use of `util.printf` to decode a numeric character-code string, indicating an attempt to exploit CVE-2008-2992. This JavaScript is likely designed to download and execute a second-stage payload. The extracted JavaScript files are listed as IOCs.

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` `6c2ef825a82bb2caf8edc7681b419c8fa3ad2c8fa709fdbf39093338a1cb5f56`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	23159 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` `15844b75338a4e440c795c4707bd4722aa902433c492fde3a848953f0c91ee82`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6815 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

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