PDF malware analysis — malicious · 9125f448d03a0969

MALICIOUS

PDF

9.5 KB

MD5: 9e40186614bc55f0060084a2e51fe7fa SHA-1: 52f89b140c7a145c7ecdc3f22c9555223b36491a SHA-256: 9125f448d03a09698b11e38e5e55d20622462698aa5f9a518cdd07944179faf2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious File: Malicious File

The PDF file contains XFA forms and embedded JavaScript, indicated by the PDF_XFA and PDF_XFA_SCRIPT heuristics. The ML classifier strongly flagged this PDF as malicious. The deobfuscated.js artifact suggests the script attempts to download and execute a second-stage payload, a common technique for initial access.

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` `d815ba42d24f70990851e36fefccd8b90e3db59e3f446654b51180b8a54e730a`	pdf-embedded-file	PDF EmbeddedFile object 41 at offset 0x52	1162 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`deobfuscated.js` `169ce5f4a0656f906df142b72ec8988ef4a4e3c79c603f2fb628bb58f29548d8`	deobfuscated-js	PDF JavaScript deobfuscation pass	2391 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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