PDF malware analysis — malicious · 306ab637f4b094da

MALICIOUS

PDF

8.7 KB

MD5: e8e6b3d1873da9579d9dc2816456d36e SHA-1: dc953b55dcecb9c5baa7e5773c9ac9054b29a74e SHA-256: 306ab637f4b094daf53e22a1a34dddd8413d06ebfa4115cef5a1d152342512cd

110 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, flagged by multiple heuristics including a critical CVE-2008-2992 trigger. The JavaScript is obfuscated and appears to be designed to download and execute a second-stage payload. The ML classifier strongly indicates malicious intent. The specific exploit used, CVE-2008-2992, involves a string-reversal technique to decode JavaScript, which is then executed.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

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)
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0001_000.js` `ad345e43fffedbea7a5cb029ab7629b83d64fa205aaa649dfa316478e8a125b1`	pdf-javascript-stream	PDF /JS object 1 at offset 0xF	67 bytes
`javascript_obj0013_001.js` `74be3b9037fabdf359e3bc7f3ab3d84241502e01513c13039f605ec7e664b88f`	pdf-javascript-stream	PDF /JS object 13 at offset 0x39D	16990 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `17a05c4567d1fb17b7f1f32f493150529f1dc3eed624d5ed7dcee4f0f437a89c`	deobfuscated-js	reverse-string concatenation decoded JavaScript at offset 0x39D	2102 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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