PDF malware analysis — malicious · b351cbc4dc951ba6

MALICIOUS

PDF

26.4 KB Created: 2011-01-24 16:45:52 +02:00 Authoring application: Instant Loan Approval For Bad Credit (via mPDF 5.0)

MD5: 4d34754eb9d41b42924d683e5cc56d36 SHA-1: e6f5b32a8731597ef12a73672c219f818da018b3 SHA-256: b351cbc4dc951ba640169fb36f8fe5f1ef79d0d4758fc13c9fefa872228b9e8e

76 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 high-severity PDF_UNESCAPE heuristic and the suspicious extracted artifact signal suggest obfuscation. The JavaScript is likely responsible for executing malicious actions, such as downloading a second-stage payload, which is a common technique for malware delivery. The specific intent of the JavaScript could not be fully determined due to obfuscation.

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 0x6157	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 0x6157	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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