PDF malware analysis — malicious · b5870d4cd0daffda

MALICIOUS

PDF

22.6 KB

MD5: ad57f4e1d28d9d693c9e3cc5e7406304 SHA-1: b2478277abeeb35256a304f6dd21f746a6a81420 SHA-256: b5870d4cd0daffda614aa380e949480a7e5c66480d796c0656e1770b63890886

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that utilizes eval(), unescape(), and String() functions, indicating obfuscated code execution. The critical CVE-2008-2992 heuristic firing confirms the use of a known exploit targeting Adobe Reader's util.printf function to trigger the JavaScript execution. The embedded JavaScript is designed to download and execute a second-stage payload, as evidenced by the deobfuscated JavaScript stages.

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` `c62d6e5cc2ee99b1e1314b5ce34ab8b7a8db8db08b559698de4f2433bc72e884`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3893 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` `bb2fa6d946f92d3b9a2161b5699edcfb1986d9ae0e0154ce49fd986a6f27fa16`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x10F9	14725 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_obj111713_002.js` `65d1b7224501a2d25c1305920bdcd6a5fb3a534e8d7b920c82239d2da338222e`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x4AB4	3961 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).
`legacy_pdfkit_stage_000.js` `8b67a5b8df03e568b7488d8e1999bf0df1b4385493de0b6435d01c3255117f8e`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x10F9	1416 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` `11da00352df4012e54cdb309d2877a51f681f620cd617a4637a858cb2fbf3e1a`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x4AB4	390 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_002.js` `792056023e9ef1d906aa74fd97d8cf74fabdbb896b5341a5bdf37d7d316804b4`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0x10F9	1807 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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