PDF malware analysis — malicious · e73ca59e342bf00b

MALICIOUS

PDF

27.4 KB

MD5: f07acd88819dab5dd0e04332e0b36bfa SHA-1: 15b93839ae97caef6bea102d761941c1bb057dea SHA-256: e73ca59e342bf00babf2a30c3b8c43773e5e7e5d82da5aee7841d5fe77d874a4

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1071.001 Web Protocols T1204.002 Malicious File

The PDF sample contains heavily obfuscated JavaScript, including multiple eval() and unescape() calls, indicative of exploit kit activity. The critical CVE-2008-2992 heuristic firing confirms the use of a known exploit targeting Adobe Reader. The embedded JavaScript streams and deobfuscated stages suggest the primary function is to download and execute a secondary payload, likely from a remote server. The ML classifier strongly supports a malicious verdict.

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` `c8decf1ec05f5fdb023d067fb3e2aa6619e9a624c9ee04755d2312f2c28bc188`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3982 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` `e5252360b0d6f9c5ef000f69f72e78e7e5b52453389aca43b29ba5a1f624d380`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x1152	19056 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` `9fd6a3fd5a1ca17c8141c80595e5a015c93264ddd6398424bdc6b636240de5d3`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x5BF8	4399 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 0x1152	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` `e282e90aa5eca950df2ca38b720cea9e6025f175e744e4f996f2c8820ba8b08c`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x5BF8	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` `c6ed0250e9ba7991446187d3f21f95da030a85919c190dc1fa364a194b510be3`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0x1152	1799 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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