PDF malware analysis — malicious · 3baf2370b3a8cb70

MALICIOUS

PDF

26.4 KB

MD5: 22c756bb2b94c2c35b47677c1e51bcee SHA-1: 1a4f53baaca8838a14e8936dfb4a120b6f604c73 SHA-256: 3baf2370b3a8cb70d0844c74e989cc29ae6cef8b75c4236420feba87d87ca335

158 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious File T1059 Command and Scripting Interpreter T1140 Deobfuscate or Obfuscate Malicious Code

This PDF document exhibits multiple high-severity heuristic firings indicating malicious intent, including embedded script payloads and XFA form exploitation. The presence of an embedded file artifact, 'embedded_file_obj0008.bin', suggests it is designed to deliver a secondary stage. The ML classifier strongly flags this PDF as malicious. The document body contains obfuscated JavaScript, likely intended to download and execute a further payload.

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` `e0bc5b4d4560ae56b1f054ef0574280520f7b6c1556e18c3d6d91c8fdc35ff5e`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xC6	26297 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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