PDF malware analysis — malicious · f66e308ae64e49f0

MALICIOUS

PDF

43.1 KB

MD5: f7c5f7441733138c7f183b7e28955792 SHA-1: 85662c68ab7118feebfb0f1d5d970f4fd6a639a4 SHA-256: f66e308ae64e49f0021978a9a0bca24c514d6e1cfe6e95e72133806a1b171b09

102 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file exhibits multiple indicators of maliciousness, including embedded JavaScript, obfuscated streams, and a high ML classifier score. The presence of embedded JavaScript, specifically within the 'javascript_obj0012_000.js' artifact, strongly suggests an attempt to execute malicious code. The obfuscation techniques used, such as String.fromCharCode and ASCIIHexDecode, are common in malware to evade detection. The overall behavior points towards a downloader or dropper, designed to fetch and execute additional malicious payloads.

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` `8812451e3fa7dac3bd63e8fae656a26a7a7028f2db8838bf888116059a77e519`	pdf-javascript-stream	PDF /JS object 12 at offset 0xA0B2	3869 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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