PDF malware analysis — malicious · a858d444a331e7b5

MALICIOUS

PDF

68.6 KB Created: 2010-03-17 12:18:48 Authoring application: xgzUZ (via zqnEJHxLwtm)

MD5: b742ced8ab1f2381791551269f91ca2b SHA-1: 034c234bea2f470e1684a0c2baabe02a78b3117d SHA-256: a858d444a331e7b5b6d373d407181c9a2106b7b37ba7dbe5d1a34429763c47f6

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and a high-confidence PDF_EVAL rule. The JavaScript stream is obfuscated, and a specific heuristic identified potential script obfuscation indicators. The primary function of the embedded JavaScript appears to be executing arbitrary code, likely to download and run a second-stage payload. The obfuscation and use of eval() suggest an attempt to evade detection.

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
JavaScript action low 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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `876e2f55a9f113423408c44c3323c1f94c770422c1a0f1815330e4e595eeec5b`	pdf-javascript-stream	PDF /JS object 7 at offset 0x246	69044 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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