Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f1944d6bceb761…

MALICIOUS

PDF

396.1 KB Created: 2009-08-10 21:37:15 +08:00
MD5: 7545057e6265b817b66972bf34873c4f SHA-1: af89a7799e4cc7025cf0ef6cc67515e17a8c16c4 SHA-256: 51f1944d6bceb76183b800b73d6b8b5b1aa4ab0b9a8f2f5f35d215c96808f914
168 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript and a Flash object, indicating an attempt to exploit vulnerabilities. The ClamAV detection 'Pdf.Exploit.Agent-14244' strongly suggests malicious intent. The embedded JavaScript, particularly the use of eval(), is likely responsible for executing a malicious payload, though the exact nature of the payload is not fully discernible from the provided evidence.

Heuristics 9

  • ClamAV: Pdf.Exploit.Agent-14244 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-14244
  • 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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