PDF malware analysis — malicious · 9330caf9484fa946

MALICIOUS

PDF

26.4 KB

MD5: 50ebc106d4156429262370de9487a050 SHA-1: 013693d59c38ef43cfd071203f005b584e39149e SHA-256: 9330caf9484fa9462451f41903907a09afe41beb0dcaddd4a45f10ca9afc067e

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1027 Obfuscated Files or Information

The PDF file contains obfuscated JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, PDF_EVAL, and a critical CVE_2008_2992 alert. The JavaScript uses eval() and unescape() functions, along with string concatenation, to hide its malicious intent. The primary function of the script appears to be downloading and executing a second-stage payload, as suggested by the 'legacy_pdfkit_stage' artifacts. The obfuscation and use of eval() are common techniques for evading detection.

Heuristics 5

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
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.
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 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `c1d08d967d9e08336af388093adc18cedad9d3e61733a08cecce929504a28199`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	4067 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`javascript_obj111712_001.js` `5c3e1aa84af24a581a59c2f6ffbd1c3f62b1935cfffe83ca3c8e9145635195c9`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x11A7	17362 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).
`javascript_obj111713_002.js` `6e5902aa48e437770b78910dc250a78b7bf407160a587601ce9dda8aaba7b9aa`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x55AF	5027 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `a63d87f2b143513c65d1743d1dc1458eace0797e16ff17319fa0a362817b3dff`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x11A7	1413 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `34feebbbf0ee64a52f53dce0c98530b4b073203d6a605ba6fc0e3a735084f8c8`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x55AF	384 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_002.js` `2ffe1558c75de07adb2e228a0b31dc4e451e2333af7165a7a6eb38855ef6e09f`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0x11A7	1798 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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