PDF malware analysis — malicious · 49cf2797603ba788

MALICIOUS

PDF

24.7 KB

MD5: a42b6354629c7106ed7ec53269b9be87 SHA-1: e3647a575962cc274bbcc0953b88d8ec606c196f SHA-256: 49cf2797603ba788b51b7700f64918247165ca02210d071620e1cc2ab7b4a71b

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 (util.printf). The JavaScript appears to be heavily obfuscated, but the presence of eval() and the specific CVE firing indicate an attempt to download and execute a second-stage payload. The extracted JavaScript files and the PDF heuristics strongly suggest a exploit kit delivery mechanism.

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` `b4fde2c47a9144fe4542555dcef18fbcb259f5479100103dfa1400141b242f7a`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	4021 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_obj111712_001.js` `2d30fa17dad261ffcdcc49da5febfcdc9477f40ae9e6644b8396f22a3d11c121`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x1179	15701 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` `782208b08745bfdf5c4ff5353b9e51a6ff73ac0fa9a8443728c370bc5126b050`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x4F04	5031 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` `dbe01518b6a8db7308991e6b256e5654c3b579ecea8168cea182dab0b84bd6b8`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x1179	1423 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` `e282e90aa5eca950df2ca38b720cea9e6025f175e744e4f996f2c8820ba8b08c`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x4F04	385 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_002.js` `e3f2247df0b2025b6e11c4d1be7fa270566332e82d67bcf147d5ff395e42fca3`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0x1179	1809 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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