PDF malware analysis — malicious · 2c66e730ba14979a

MALICIOUS

PDF

11.0 KB Authoring application: .a

MD5: 65fb73e5263650bf5a08177e57ea2387 SHA-1: b63ac0e0a78d69ef75eb3bf43dd25d10cdb29741 SHA-256: 2c66e730ba14979ac756d9b297e7dd21b279666c0ebb5e7aa0b7d54db0f0eb71

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream is obfuscated, as suggested by the PDF_UNESCAPE and PDF_FROMCHARCODE firings, and the 'Script obfuscation indicators' triage signal. The embedded JavaScript file, 'javascript_obj0018_000.js', is the primary artifact. The likely intent of this script is to download and execute a second-stage payload, although the exact mechanism is obscured. The document body text is largely unreadable and does not provide further context.

Heuristics 5

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
Suspicious extracted artifact info 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0018_000.js` `d54c2b959f19d21c6aeefd8fe679d3c8447bb4c4dcf8533a8819038da2ddc72a`	pdf-javascript-stream	PDF /JS object 18 at offset 0x4BA	163461 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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