PDF malware analysis — malicious · f417846d7ab2f44e

MALICIOUS

PDF

51.7 KB Created: 2011-10-06 11:24:21 +03:00 Authoring application: Wiki Loan Without Credit Check (via mPDF 5.0)

MD5: 78165b1f33dfb5ce75ac3182986f85f9 SHA-1: 6b5716f08da66e6bba8cb4676135757770ae9531 SHA-256: f417846d7ab2f44ef0cc805f7ad2dfdc79defebc82bd015008540a104824a94b

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 presence of unescape() calls and suspicious extracted artifacts suggests obfuscation. The JavaScript is likely intended to download and execute a second-stage payload, although the exact functionality is obscured. The file type and the nature of the heuristics point towards a malicious document designed for exploitation.

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 0xC71C	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 0xC71C	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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