PDF malware analysis — malicious · b9375ded0e78832a

MALICIOUS

PDF

24.4 KB

MD5: 0524d0ccae2af3ac30ca90d21d7cc992 SHA-1: 1a78e824a898eafb940564efe8cb0a813038f233 SHA-256: b9375ded0e78832aa268cbe662c565e14515924903e275d3f5774d524e3f4e4d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains an XFA form with embedded JavaScript, indicated by multiple high-severity heuristics including PDF_XFA_SCRIPT and PDF_EMBEDDED_SCRIPT_PAYLOAD. The ML classifier strongly flagged this PDF as malicious. The embedded script likely attempts to exploit a vulnerability, potentially leading to the download and execution of a second-stage payload, as suggested by the PDF_EMBEDDED heuristic and the presence of an embedded file. The specific exploit and payload are not directly discernible from the provided evidence.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 8

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.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
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.
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.
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/xfa-template/2.5/
- http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0008.bin` `6aacd0126b3d2f8696f3d5b7b857b295eddbdbba3f1e1a6b6438b4a5882c991d`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xC6	24266 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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