Malicious PDF — malware analysis report

Static analysis result for SHA-256 e55727a8a8bb4d35…

MALICIOUS

PDF

35.9 KB Created: 2010-10-16 15:03:49 First seen: 2026-05-08
MD5: 43c563275b85206fdbda9934e17ef91a SHA-1: 8db1fe90513a1dbaadc715289fd2c56aab52134a SHA-256: e55727a8a8bb4d358bc12b16c92abc091eb7b9049026e0f4ed508c28834f69fa
76 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The presence of ASCIIHexDecode filter with exploit indicators further suggests an attempt to conceal malicious code. While the document body is unreadable, the embedded JavaScript is the primary indicator of malicious intent, likely to download and execute a second-stage payload. The specific URLs found are related to XFA, a form technology, but their reputation is unknown, warranting caution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX
    Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
  • JavaScript action low 1 related finding 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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://ns.adobe.com/xdp/ In PDF document text
    • http://www.xfa.org/schema/xci/2.6/In PDF document text
    • http://www.xfa.org/schema/xfa-template/2.6/In PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0022_000.js pdf-javascript-stream PDF /JS object 22 at offset 0x8779 81 bytes
SHA-256: f1fe082ae335345df486a7d47d467fb6c13534787216bea863054635852e294e
Preview script
First 1,000 lines of the extracted script
function go_to(pg){
	this.print({
	bSilent: true,
	nStart: pg,
	nEnd: pg
	});
}

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