Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dfc83cd5cd9329c…

MALICIOUS

PDF

396.1 KB Created: 2009-08-10 21:37:15 +08:00
MD5: 09492f6e96c0692a5b8876aeef817941 SHA-1: 1b73b710d9b553485351e1b3095df415d5938062 SHA-256: 0dfc83cd5cd9329c2ba801d657764dc4588330abfb6cc26c4f18064057da780b
200 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript that is heavily obfuscated and utilizes eval() calls, strongly indicating malicious intent. The JavaScript is designed to download and execute a secondary payload, as evidenced by the ML classifier and heuristic firings related to JavaScript exploits. The presence of an embedded Flash file (kp.swf) may also contribute to the exploitation chain. The document body is unreadable, but the technical indicators point to a common PDF-based malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

Heuristics 9

  • 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.
  • RichMedia (Flash) high PDF_RICHMEDIA
    PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector (matched inside decoded stream)
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  • 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
  • PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE
    PDF has 1 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.
  • 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/pdf/1.3/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
kp.swf
0e2a801ee2b80cc80ded42bb0bcf5a4edc721545bca8fb4ef2093aee341d0031		 pdf-embedded-file PDF EmbeddedFile object 34 at offset 0x61C75 1297 bytes
javascript_obj0042_000.js
a54deeef139006699bbe54f0e6bf4e4a43b704fd16e1c47cba5b89e99e8f651a		 pdf-javascript-stream PDF /JS object 42 at offset 0x627C0 5738 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 7 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
objstm_0043_00.bin
4160206096ba0a9ce078e6d64a22cb5f37889aea9c2c0dd1148fc9eb9824c27e		 pdf-objstm-decoded PDF /ObjStm 43 0 obj (inflated) 572 bytes
objstm_0048_00.bin
3860eed002ebedc177f7b2ece43ed5eb553e0ad7d0a865d847b24afa560a5993		 pdf-objstm-decoded PDF /ObjStm 48 0 obj (inflated) 455 bytes

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