PDF malware analysis — malicious · 21b1626f1ea2e6cd

MALICIOUS

PDF

23.1 KB

MD5: fdb7f605a08d0876ad1cb78d4a96ece3 SHA-1: f61da5f92d63a870cc324a825b44e537d741dc56 SHA-256: 21b1626f1ea2e6cd37e223de0fb2bebd36b96abcb7b858961002cdd6a52258bc

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF sample utilizes embedded JavaScript, specifically triggering CVE-2008-2992 via `util.printf`. The JavaScript appears heavily obfuscated, but the presence of `eval()` and `unescape()` calls, along with the ML classifier's high confidence, indicates malicious intent. The script likely decodes and executes a second-stage payload from a hidden section within the PDF, aiming to compromise the user's system.

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` `c1d08507758a9b01125d469f2542095f5f04839f439d924d1d9b51deb39f0fd8`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3678 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` `69f20ce35675503b1e3f181d73a0a899562838dfa31ed5609eb419f5bcd498e8`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x1022	14246 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_obj111713_002.js` `bd94acc6d94f5bfc429266eb1932160e3d4cc807b1c00ac11584062e5796d286`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x47FE	5119 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` `a63d87f2b143513c65d1743d1dc1458eace0797e16ff17319fa0a362817b3dff`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x1022	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` `f9d815fc9bfc10173079bde17bedfffae0cd661ab8cd7ec5d9f73a43ee041bfe`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x47FE	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` `9d1140a106d5a70424c5222436714bf6bc682b1a2ff2916d82890884e2f97f1b`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0x1022	1805 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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