PDF malware analysis — malicious · 19ed5a528fbd39d6

MALICIOUS

PDF

43.1 KB

MD5: a6135930aeacf9f7db60345886e870ba SHA-1: 63be83c928ed1b39cdd1119484776ee072adc4cd SHA-256: 19ed5a528fbd39d60ca7009384d72bc2e108f38d89cf5254c3f5b61b0afd317a

102 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file exhibits multiple indicators of maliciousness, including embedded JavaScript streams, ASCIIHexDecode filters with exploit indicators, and a high score from an ML classifier. The presence of a JavaScript object file suggests an attempt to execute malicious code. The obfuscated nature of the script and the ML classification strongly indicate that this PDF is designed to deliver a malicious payload, likely through the embedded JavaScript.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 7

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
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.
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
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)
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/
- http://www.xfa.org/schema/xci/2.6/
- http://www.xfa.org/schema/xfa-template/2.6/

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0012_000.js` `8884f8b245e514d2898cee1b515e3d71cc0f5e2f9cb06ef1ca977d1b2f882115`	pdf-javascript-stream	PDF /JS object 12 at offset 0xA0B2	3861 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s). Carved artifact contains 4 long hex-escaped blob(s).
`font_00_sfnt_off0000033c.bin` `26f3e7c91c76e658576c1bbb605ddb8e33e657870ea2f8ad3b8fe8f80b303358`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x33C	65932 bytes

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