PDF malware analysis — malicious · 7bb4f4bad2f14cd9

MALICIOUS

PDF

53.2 KB Created: 2011-02-02 17:39:06 +02:00 Authoring application: USA Online Loans Center (via mPDF 5.0)

MD5: c65d6bd5201995d1d4b2fa0932dbff53 SHA-1: da999a5642b7257ace104b02a12cea493cff7586 SHA-256: 7bb4f4bad2f14cd9635349a80f360d51f64f46b03aff3f9389e7eba5c1dd28d0

106 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript streams, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier also flagged this PDF as malicious with high confidence. The JavaScript appears to be obfuscated, as suggested by the EXTRACTED_FILE_STATIC_TRIAGE heuristic which noted 'Hex escape obfuscation, Script obfuscation indicators'. The primary function of the embedded scripts is likely to download and execute a second-stage payload, though the exact mechanism is obscured. The presence of these obfuscated scripts and the high ML score strongly suggest a malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9918

Heuristics 4

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
Suspicious extracted artifact medium 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.
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0036_000.js` `357d06d70777f397a54fd04180a5ee36f36a8ec5c7cbbafdfab41f20901b25ac`	pdf-javascript-stream	PDF /JS object 36 at offset 0xCCCD	136 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long hex-escaped blob(s).
`javascript_obj0036_001.js` `607a0753f2d28ea7a383d2e729ee9a1eeb69db22eafb74fa3e1d444ae047c123`	pdf-javascript-stream	PDF /JS object 36 at offset 0xCCCD	134 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long hex-escaped blob(s).

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