Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e8329ed835a146e…

MALICIOUS

PDF

32.4 KB Created: 2013-06-29 16:33:18 +04:00 Authoring application: Adobe Designer 7.0
MD5: 5fb939de0f559f375fe5e32cffc937d0 SHA-1: 6e1d624449aae4d25ccaf2728bec888c1e7d9a83 SHA-256: 7e8329ed835a146e54e4c99861f8e6849d97b523b43e4b2c3b43884e6bbbbbad
192 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File T1566.002 Spearphishing Attachment

This PDF document utilizes XFA forms and embedded JavaScript, triggering critical heuristics related to PDF JavaScript exploits. The JavaScript code attempts to redirect the user to 'http://cgi.adobe.com/special/acrobat/update' by constructing a URL with system information, likely to prompt a download or exploit a vulnerability. The ML classifier strongly indicates maliciousness. The primary attack vector appears to be social engineering via a malicious PDF document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 9

  • 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
  • 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/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/
    • 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.xfa.org/schema/xfa-template/2.0/
    • http://www.xfa.org/schema/xfa-data/1.0/
    • http://www.xfa.org/schema/xfa-locale-set/2.1/
    • http://ns.adobe.com/xtd/

Extracted artifacts 9

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0027.bin
c06dcd026a7ea0536b63e07ce688691b585339a3ab7ff59065e546b56308c7bb		 pdf-embedded-file PDF EmbeddedFile object 27 at offset 0x22D6 85 bytes
embedded_file_obj0028.bin
7819f06630520bfd73f8079eece39a31ed650dc5a0392d84cc1a95b60eb179d9		 pdf-embedded-file PDF EmbeddedFile object 28 at offset 0x2388 1520 bytes
embedded_file_obj0029.bin
cf4da0a34fdb072b38d82de2ebc0070995f2c76ceef5a451b436d39dffe0b6c4		 pdf-embedded-file PDF EmbeddedFile object 29 at offset 0x2656 27733 bytes
embedded_file_obj0030.bin
baa8937885be1a8ebca9e140af8e0c4ab2f85ff9bb4e41ded06df279740fb11d		 pdf-embedded-file PDF EmbeddedFile object 30 at offset 0x6AA0 515 bytes
embedded_file_obj0031.bin
e705f8fbc86048d63338b8eee28deb3965d674af1b338994f05e4470e86f53c9		 pdf-embedded-file PDF EmbeddedFile object 31 at offset 0x6BA5 4643 bytes
embedded_file_obj0032.bin
57045217c453d4674a08ad8778674bf199a7989a9505424a1815c016e6bb412f		 pdf-embedded-file PDF EmbeddedFile object 32 at offset 0x6FFE 212 bytes
javascript_obj0019_000.js
4a1aca004cf20431c9a66dce85404a6411a54d881a6c257882260ffc972a13eb		 pdf-javascript-stream PDF /JS object 19 at offset 0x1B5F 870 bytes
javascript_obj0021_001.js
4e139c8b22ec16bd5aa51575c80dec2bbf89b76977a06b68473031a0eb206366		 pdf-javascript-stream PDF /JS object 21 at offset 0x1CE3 2794 bytes
javascript_obj0023_002.js
c876171bd867b66b7671fb337ff9e57d18cd15b43d344cf5a7243821300a408a		 pdf-javascript-stream PDF /JS object 23 at offset 0x1FD2 1528 bytes

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