PDF malware analysis — malicious · b26da96cb1691cdd

MALICIOUS

PDF

26.8 KB Created: 2010-12-07 23:32:02 +02:00 Authoring application: Best Credit Cards Balance Transfer (via mPDF 5.0)

MD5: bcc6c25bc54e1cc5ad0512379217b0c5 SHA-1: 65c054f787be3f48f58e52d20c07afee254c78a1 SHA-256: b26da96cb1691cdd85cdc3a9ba4d50ccf4e5042a14fb66dfb53c89ff4486a676

106 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript streams, indicated by PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier strongly suggests maliciousness. The JavaScript is obfuscated, as noted by the EXTRACTED_FILE_STATIC_TRIAGE heuristic, and uses unescape() calls, which are high-severity findings. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, although the exact nature of the payload cannot be determined from the provided evidence.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

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_obj0020_000.js` `357d06d70777f397a54fd04180a5ee36f36a8ec5c7cbbafdfab41f20901b25ac`	pdf-javascript-stream	PDF /JS object 20 at offset 0x621B	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_obj0020_001.js` `607a0753f2d28ea7a383d2e729ee9a1eeb69db22eafb74fa3e1d444ae047c123`	pdf-javascript-stream	PDF /JS object 20 at offset 0x621B	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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