PDF malware analysis — malicious · 5a1e8d56847b02e7

MALICIOUS

PDF

22.8 KB

MD5: d9542efc360356e8fff00ea82563be16 SHA-1: cd4db21d1ed30a9846061a20afafaa20b63f4ff3 SHA-256: 5a1e8d56847b02e7a3b1f92228609a22b1f9933f735acaa621c57a077de4f54a

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF sample contains heavily obfuscated JavaScript, including multiple eval() calls and string concatenation, indicating an attempt to hide malicious code. The critical CVE-2008-2992 heuristic firing confirms the use of a known exploit targeting PDF readers. The embedded JavaScript streams and deobfuscated stages suggest the script's purpose is to download and execute a secondary payload, a common technique for initial access.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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` `fbfceaaafc917ac1a9feee3f18ed455c929a5e89b9ea70fbf7cdc81a7630c917`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3723 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` `e4c6261de54c760be0feab8e31b53172e8546a3ff9dc0b032cec8a8655c13ae5`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x104F	14936 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` `dcca517d0720634d3b3c8693bdd2da45a1a979c3d2158fe11398c199d1ef6609`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x4ADD	4114 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` `2fb2c3e78ea78827c060764e295295167b4c4f08d85808e28f2d25629ac16a04`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x104F	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` `e282e90aa5eca950df2ca38b720cea9e6025f175e744e4f996f2c8820ba8b08c`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x4ADD	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` `dfd25ca58d70a341498ce9f6a5d0c5b01b5ac12c0e872a605322e5086b2c56e6`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0x104F	1802 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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