PDF malware analysis — malicious · 50bcef1ba7d5fe99

MALICIOUS

PDF

26.2 KB Created: 2011-01-17 00:54:44 +02:00 Authoring application: Pay Off My Student Loans (via mPDF 5.0)

MD5: 1aa5cef745ed3fb42d7f7a5cdef6d466 SHA-1: a74e4b7ee40699fd964da69ec0bd12749b8ba381 SHA-256: 50bcef1ba7d5fe9998d270dfd3766cc75d49cecc6d42286393893627ea426071

106 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious JavaScript

The PDF contains embedded JavaScript streams, indicated by PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier strongly flags this PDF as malicious. The presence of unescape() calls and obfuscated scripts suggests an attempt to hide malicious code execution. The extracted JavaScript files, javascript_obj0020_000.js and javascript_obj0020_001.js, are likely responsible for exploiting a vulnerability or performing malicious actions.

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 0x6133	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 0x6133	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).

Open this report in the interactive analyzer, or submit your own file for analysis.