Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe4d7342d5ad894…

MALICIOUS

PDF

249.8 KB Created: 2010-06-29 10:30:35 +08:00 Authoring application: Writer (via OpenOffice.org 3.0)
MD5: 388df7bd87e98997b4ecf8c325a023a7 SHA-1: cdbfc38ef77004d98bdb881e09cd73e546947241 SHA-256: 5fe4d7342d5ad894f63096ac5bf045200ef06b48189044560d9c63bbe8e00214
218 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Win.Trojan.Agent-36159. It contains embedded JavaScript and a Flash object, indicating an attempt to exploit vulnerabilities. A secondary embedded PDF was also found with suspicious static findings. The ML classifier assigned a high probability of maliciousness. The primary attack vector appears to be exploiting PDF reader vulnerabilities to execute embedded code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

Heuristics 9

  • Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE
    A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
  • ClamAV: Win.Trojan.Agent-36159 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Agent-36159
  • RichMedia (Flash) high PDF_RICHMEDIA
    PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector (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. (matched inside decoded stream)
  • 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. (matched inside decoded stream)
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload (matched inside decoded stream)
  • 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.
  • 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.
  • 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://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#
    • http://adobe.com/AS3/2006/builtin
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objstm_0017_00.bin
dd7918c182d6e2b8d996a6b8ee81663c49a0cb297efe1e1fa3c5af0c987bde84		 pdf-objstm-decoded PDF /ObjStm 17 0 obj (inflated) 871 bytes
polyglot_child_pdf_off0003ca87.pdf
fe1583c05ef0f6ed7c71670ad19cd2a07df15d70ab1eb8a466454eab6eb1f527		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x3CA87 7293 bytes
polyglot_child_pdf_off0003cf17.pdf
0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x3CF17 6125 bytes

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