Malicious PDF — malware analysis report

Static analysis result for SHA-256 99e68b14b7f7f5c2…

MALICIOUS

PDF

382.5 KB Created: 2009-08-06 08:45:36 -03:00 Authoring application: Acrobat 编辑器 8.0 (via Adobe Acrobat 8.0)
MD5: 26d75268b19d528dfcfae9142939bb24 SHA-1: bf6f040639f6dff937869823102adbe1059e1ed5 SHA-256: 99e68b14b7f7f5c21ab154423a338baf3edd0d3d59a4a1a4ed32bb61f7c544cd
138 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a Flash object, both flagged as high-risk. The ML classifier strongly indicates maliciousness. The presence of embedded files, including a JavaScript file and another PDF, suggests a multi-stage attack. The primary intent appears to be the execution of malicious code via the embedded scripts, likely leading to the download of further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 8

  • RichMedia (Flash) high PDF_RICHMEDIA
    PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
  • Secondary embedded PDF body has suspicious static findings high 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.
  • 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
  • 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://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • 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
opening_animation.swf
917b58b57f117c208dbdbb38b9675db5d304a168912a042ce346da196cb89439		 pdf-embedded-file PDF EmbeddedFile object 29 at offset 0x567CE 1165 bytes
javascript_obj0034_000.js
64273ec2489853bda15daef0c125290188ba1ddfee3161c3b00c3888c70a4f30		 pdf-javascript-stream PDF /JS object 34 at offset 0x56F59 8192 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 long base64-like blob(s).
polyglot_child_pdf_off0005bae6.pdf
93de7b53c4b40efaaddf2289f27d26eeb6e81c5110a1f4bd8c1bc5169000bbf4		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x5BAE6 16191 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 long base64-like blob(s).

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