Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fd6ee80a1a5df06…

MALICIOUS

PDF

29.8 KB Created: 2013-03-06 11:29:15 +03:00 Authoring application: Adobe Designer 7.0
MD5: 8fcbb25f85fa28e55016b4f7b809dc4b SHA-1: 85c569f43e0eb679d0a9e4201e4e237333272f43 SHA-256: 6fd6ee80a1a5df062c90f73ecfdc94f765279a605242d8ceed19e89ed3b07b32
184 Risk Score

Malware Insights

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

The PDF file contains XFA forms with embedded JavaScript, a known vector for exploiting vulnerabilities in Adobe products. The JavaScript attempts to redirect the user to 'http://cgi.adobe.com/special/acrobat/update', likely to download and execute a malicious payload. The ML classifier strongly indicates maliciousness, supporting the exploitation of a client execution vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 11

  • 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.
  • 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
  • Embedded script payload in PDF stream low 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.
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/
    • 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-data/1.0/
    • http://www.xfa.org/schema/xfa-locale-set/2.1/

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 0x2393 85 bytes
embedded_file_obj0028.bin
e0092de902c56590f704951aaaca149b1d7b8f021514c930acc8c4849b18f0b0		 pdf-embedded-file PDF EmbeddedFile object 28 at offset 0x2445 1182 bytes
embedded_file_obj0029.bin
fe5ddb89361615e1381bafaa8febd0529302627fd030c9b76670039a5b3d5d60		 pdf-embedded-file PDF EmbeddedFile object 29 at offset 0x2695 7697 bytes
embedded_file_obj0030.bin
3dd68f00f4fcb366a2a3a17c65cb2626eeddf5ea5713302d374310561d810169		 pdf-embedded-file PDF EmbeddedFile object 30 at offset 0x355A 144 bytes
embedded_file_obj0031.bin
ce4a3f07835c725838e55947d6b1f21771e0ad8084ee86d0890ecc12bd5231fd		 pdf-embedded-file PDF EmbeddedFile object 31 at offset 0x361C 2427 bytes
javascript_obj0019_000.js
4a1aca004cf20431c9a66dce85404a6411a54d881a6c257882260ffc972a13eb		 pdf-javascript-stream PDF /JS object 19 at offset 0x1C1C 870 bytes
javascript_obj0021_001.js
4e139c8b22ec16bd5aa51575c80dec2bbf89b76977a06b68473031a0eb206366		 pdf-javascript-stream PDF /JS object 21 at offset 0x1DA0 2794 bytes
javascript_obj0023_002.js
c876171bd867b66b7671fb337ff9e57d18cd15b43d344cf5a7243821300a408a		 pdf-javascript-stream PDF /JS object 23 at offset 0x208F 1528 bytes
font_00_cff_off000039ec.bin
b09fc3efc55c0a015e72bd423dd6024c284ef2baabd0b6726844dae1bf53e012		 pdf-font-stream PDF embedded font (cff) at offset 0x39EC 6616 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.41, consistent with packed or encrypted content.

Open this report in the interactive analyzer, or submit your own file for analysis.