PDF malware analysis — malicious · c426668be38b69f6

MALICIOUS

PDF

9.3 KB

MD5: d16bbf79778749348bc417508cdcb54d SHA-1: 767fc785a55a9719a1ce61c6ee7b1c9ab67b7037 SHA-256: c426668be38b69f6ec1e3ef830ce41dd247deb7e4a4b8f8b31394b7a22413944

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 Scripting: JavaScript T1204.002 Malicious File: Malicious File

The PDF file contains XFA forms with embedded JavaScript, flagged by high-severity heuristics. The JavaScript, named 'deobfuscated.js', is likely responsible for executing a malicious payload. The ML classifier strongly indicates maliciousness, and the embedded file suggests a secondary stage.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

XFA form contains risky executable script high CVE related PDF_XFA_SCRIPT

PDF embeds an XFA form whose script block contains exploit, submission/launch, or shell-execution primitives. Ordinary LiveCycle print/update scripts are left as generic XFA/JS signals unless stronger behavior is present.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD

PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
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)
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0041.bin` `6552e99df8678e3d927d8161d1047943a75cbb46bf9f25297c1c3efc6c131447`	pdf-embedded-file	PDF EmbeddedFile object 41 at offset 0x52	1164 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`deobfuscated.js` `d03247ae5ff75db7bf1756642b77e4d491247854f10331c74975dc981aac4e13`	deobfuscated-js	PDF JavaScript deobfuscation pass	2369 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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