PDF malware analysis — malicious · 2ca6c9b5a0d8dcc3

MALICIOUS

PDF

9.3 KB

MD5: baf5b4c02c615dabcf26e4c074adecac SHA-1: 533f7700862cc780812753395e9026f4c0e58d2e SHA-256: 2ca6c9b5a0d8dcc3bab033fe40f6c605f9eea01f52dd3f5f2460837f955e22d5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 Service Execution: JavaScript T1204.002 Malicious File: User Execution: Malicious File

The PDF contains XFA forms and embedded JavaScript, flagged by high-severity heuristics. The JavaScript, identified as 'deobfuscated.js', is likely responsible for executing a secondary payload, as indicated by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' and 'ML_NYX_PDF_MALICIOUS' firings. The embedded file 'embedded_file_obj0041.bin' is also suspicious. The combination of these factors strongly suggests a malicious document designed to deliver further malware.

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` `787b1a3991506809f4be0d8e4d2c393410ac82f7fbf776c1067b2c170aa426c3`	pdf-embedded-file	PDF EmbeddedFile object 41 at offset 0x52	1160 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`deobfuscated.js` `a0d3aa0ae09015435b128af79739f3b77ae392541c880ab0c8e7b054705f7638`	deobfuscated-js	PDF JavaScript deobfuscation pass	2402 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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