Malicious PDF — malware analysis report

Static analysis result for SHA-256 01d658190ae4dbd3…

MALICIOUS

PDF

279.2 KB Created: 2004-09-30 17:04:10 +09:00 Authoring application: Adobe Designer 7.0
MD5: d1984dbf67799c2e34e4f4444a53bfec SHA-1: d410a9dad6ed6d9d3e5404af3131dbe7fddeddea SHA-256: 01d658190ae4dbd3db8866c6d9d3853b8e1e16b2353217a50ed62934f51752cf
194 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains XFA forms and embedded JavaScript, which are flagged as risky. The JavaScript code constructs messages and prompts that mimic Adobe Reader/Acrobat update notifications. The primary goal appears to be social engineering the user into visiting the URL http://cgi.adobe.com/special/acrobat/update to download a malicious payload disguised as a legitimate update.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9334

Heuristics 10

  • 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.
  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://cgi.adobe.com/special/acrobat/update
    • http://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/1.0/
    • http://www.xfa.org/schema/xfa-template/2.1/
    • http://www.xfa.org/schema/xfa-template/2.2/
    • http://www.w3.org/1999/xhtml
    • http://www.xfa.org/schema/xfa-data/1.0/
    • http://ns.adobe.com/xfdf/
    • http://ns.adobe.com/xtd/

Extracted artifacts 12

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0415.bin
c06dcd026a7ea0536b63e07ce688691b585339a3ab7ff59065e546b56308c7bb		 pdf-embedded-file PDF EmbeddedFile object 415 at offset 0x3FD08 85 bytes
embedded_file_obj0416.bin
f109609a93df51dd429080fcea4ee57ee0645e82578bc79b32711bfb7b48de01		 pdf-embedded-file PDF EmbeddedFile object 416 at offset 0x3FDBB 1460 bytes
embedded_file_obj0417.bin
7c455378a9972ca01ee0fb008a71fe1ec5978b81309124458716b07988023d7e		 pdf-embedded-file PDF EmbeddedFile object 417 at offset 0x4009D 78551 bytes
embedded_file_obj0418.bin
266158cfbb7a42f2e215feb06800ea0910930e8093e8d6c5643570e6db351661		 pdf-embedded-file PDF EmbeddedFile object 418 at offset 0x42767 1187 bytes
embedded_file_obj0419.bin
9708462c0407442fc80b1370df81a02dc9eb16aad8c8c746a3ce9ff7372b72b5		 pdf-embedded-file PDF EmbeddedFile object 419 at offset 0x42995 765 bytes
embedded_file_obj0420.bin
a60265344cf1a9e94da34c8f587f64a4297e2fa417c895852209903ab7588bcc		 pdf-embedded-file PDF EmbeddedFile object 420 at offset 0x42B8D 85 bytes
embedded_file_obj0421.bin
57045217c453d4674a08ad8778674bf199a7989a9505424a1815c016e6bb412f		 pdf-embedded-file PDF EmbeddedFile object 421 at offset 0x42C39 212 bytes
javascript_obj0407_000.js
3fe3331414779367c1decc601653e8c35f6028fab9ce092c46764fc4733ff07b		 pdf-javascript-stream PDF /JS object 407 at offset 0x3F56B 422 bytes
javascript_obj0409_001.js
e31b05aa8ed6457f9d914011534d4280a5c5a77022a024018b5f5e053fc7bb36		 pdf-javascript-stream PDF /JS object 409 at offset 0x3F6B9 3432 bytes
javascript_obj0411_002.js
b950d0d3a9a89972a1c31c3f348f499c10deb7b73ec3e56c8302fc1faa40e7d0		 pdf-javascript-stream PDF /JS object 411 at offset 0x3FA11 1552 bytes
font_00_cff_off000022ff.bin
19bc268243419390efbe4d4a72616ba894a394856f2c9ca5fc68f8c8c3d28328		 pdf-font-stream PDF embedded font (cff) at offset 0x22FF 67274 bytes
font_02_cff_off0001aff1.bin
96161e3d15cf67591ef2a1c87940c8dc0af59a94fcfab5d6bfcf4cb992a24af8		 pdf-font-stream PDF embedded font (cff) at offset 0x1AFF1 64586 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.45, consistent with packed or encrypted content.

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