Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c8d00054963063b…

MALICIOUS

PDF

352.2 KB Created: 2009-08-06 08:45:36 -03:00
MD5: 24aaab8a2ab14c38b0e635df0c7e667e SHA-1: 6741a0e7c0399e0fb8ccf9e85ea6935a24db5061 SHA-256: 9c8d00054963063bf7b6fda2534dc0e1c9e971d39ec7945ab9ba372df7bf7d42
142 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and a Flash object, both of which are commonly used to deliver exploits. The ML classifier strongly indicates maliciousness. The embedded JavaScript stream, named 'javascript_obj0034_000.js', is the primary indicator of malicious activity, likely serving to download and execute a second-stage payload. The presence of unescape() calls and RichMedia (Flash) further supports the exploitation vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 9

  • RichMedia (Flash) high PDF_RICHMEDIA
    PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (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.
  • 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

Extracted artifacts 2

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
1f86fc7c107ecd42809fdc372cb04448d762f9f5f79d817fd7d079add6f887a1		 pdf-javascript-stream PDF /JS object 34 at offset 0x56F59 15739 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).

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