PDF malware analysis — malicious · 944049b7906c044e

MALICIOUS

PDF

4.1 KB

MD5: 5407c7d1212b604849fcd4c2b4ab0b50 SHA-1: f4789f9dfc0a79f0b9dfa4b8290669e79207a0f3 SHA-256: 944049b7906c044eb43f538d80c8ccc3f9d1f80fee0d26af24bfcf58e9bd5ef7

176 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The critical CVE-2008_2992 heuristic specifically points to the use of util.printf and numeric character-code string decoding to execute JavaScript. This suggests the document is designed to exploit this vulnerability to download and execute a secondary payload. No specific family could be identified, but the attack pattern is consistent with a malicious PDF dropper.

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)
Suspicious extracted artifact high 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.
String.fromCharCode medium PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically (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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `2064668303dfccfede74d781655012a38b2c4a3cf2c625153c2315578110ebc3`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	20984 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` `6b9aa184a83b4bc5813fb26581c43ac911ee8ca82d11579f1192d58e8d166499`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6155 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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