PDF malware analysis — malicious · bf2c8d1db5b658f2

MALICIOUS

PDF

23.2 KB

MD5: 1e2d6ea522fb7d80d368a00b149bb526 SHA-1: 34d8d98b410fdb3460b6a35f0b8eb76a4a961d58 SHA-256: bf2c8d1db5b658f2edf4ad73529952f81ea76e4a6027e61350aff43da3b39d9a

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that utilizes the eval() function and the CVE-2008-2992 exploit. The JavaScript is heavily obfuscated, but static analysis indicates it decodes and executes a second-stage payload. The presence of multiple JavaScript streams and deobfuscated JS files points to a multi-stage attack designed to download and run further malicious code.

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` `f886a36c1e2976fc12d016c437b7cf949f6b07bee32a79fa9ea34648039bfa70`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3744 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_obj111712_001.js` `2f3976610de9de009941d0fa5e67547c42f77b6ec3a5fdfe2bb85e84b5d5422d`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x1064	14710 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).
`javascript_obj111713_002.js` `0a9076643cba8257ba4a8b5c48cb7c511c5ea52e1a36eae2f0f23ba94d27973e`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x4A10	4707 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).
`legacy_pdfkit_stage_000.js` `a9bd720854cdcf46b057f8e141e3ecae75abc3a62289c064f417a7b440584cb4`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x1064	1414 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` `f384fe99f3bfb1eee56961397c696d9d68c9887b9148ac0157029ea755b28318`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x4A10	391 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_002.js` `dff0e26df69280fe785c0c18ad02d60cd1308c046eb735a4c20e389277e3b4ab`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0x1064	1806 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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