PDF malware analysis — malicious · e0744dfffc4b3ab6

MALICIOUS

PDF

52.1 KB Created: 2010-12-07 15:54:57 +02:00 Authoring application: Bad Credit Payday Loans Online (via mPDF 5.0)

MD5: 27e0c72a2e41accea3db548ae5c3137a SHA-1: e556f58ce82ed950ea6974332185e997aac86f30 SHA-256: e0744dfffc4b3ab6ba3f9fec37e9dada49e2ae7d7dcd2b9fe87860c775c1e8d2

108 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 appears to be obfuscated, as suggested by the EXTRACTED_FILE_STATIC_TRIAGE heuristic and the use of unescape() calls. The embedded JavaScript likely downloads and executes a second-stage payload, though the exact actions are obscured. The presence of two JavaScript objects suggests a multi-stage approach.

Machine Learning

Nyx PDF Classifier malicious score 0.9930

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_obj0034_000.js` `357d06d70777f397a54fd04180a5ee36f36a8ec5c7cbbafdfab41f20901b25ac`	pdf-javascript-stream	PDF /JS object 34 at offset 0xC6D0	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_obj0034_001.js` `607a0753f2d28ea7a383d2e729ee9a1eeb69db22eafb74fa3e1d444ae047c123`	pdf-javascript-stream	PDF /JS object 34 at offset 0xC6D0	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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