PDF malware analysis — malicious · 7ef7490c855655dd

MALICIOUS

PDF

4.2 KB

MD5: ae435027bc15e8070e2d47c92aaa5de2 SHA-1: ab47cff6dea6bdeb82310dccf01ab065eb83a7fc SHA-256: 7ef7490c855655dd63bf3d90fb32c429ce1e8927d9775156af647bdd2ccd1ef6

126 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF document contains embedded JavaScript that leverages the CVE-2008-2992 vulnerability. The heuristic firings indicate the use of eval() and String.fromCharCode, common obfuscation techniques. The embedded JavaScript streams, particularly 'numeric_charcode_stage_000.js', are likely responsible for decoding and executing a further payload, although the exact nature of that payload is not discernible from the provided evidence. The exploit targets user interaction to trigger the malicious script execution.

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` `0ab243125a83682f4f9ba2c05cd6856ac452e35bda9e0f8e0e63ec11b9d66a3c`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	21961 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` `5edde93f586e6cb6fd740eaf5db6a0bab03f2d62f4a574819776e151c040b28c`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6475 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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