Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2f8fbd2302399d5…

MALICIOUS

PDF

11.1 KB
MD5: 0c0eabd8f08522d23f6e3ac5ade6788e SHA-1: 6641a98c0c6c3df013b41b1d516fe23038a967dc SHA-256: f2f8fbd2302399d58d9ebc448e87d94206812efd0082177a9a2727396939e805
130 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1027 Obfuscated Files or Information

The PDF contains embedded JavaScript which is heavily obfuscated using `eval()` and `unescape()` calls. Static analysis indicates this script is designed to download and execute a second-stage payload. The ML classifier strongly flags this PDF as malicious, supporting the conclusion that it's a downloader. No specific family could be identified due to the obfuscation and lack of further indicators.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  • 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.
  • 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://ns.adobe.com/pdf/1.3/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0024_000.js
5419fab14252b6d5baeaabb7a8450fd25a70abc635f0ca2e77f0f5ec0ffd1f47		 pdf-javascript-stream PDF /JS object 24 at offset 0x2667 2605 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).

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