PDF malware analysis — malicious · 483b40480254fefd

MALICIOUS

PDF

75.2 KB Created: 2010-03-15 20:04:41 Authoring application: MNO8u (via riHErmDno)

MD5: 1fd83e45ef66870870ae10db61e37189 SHA-1: b38d05924ee4eb898a206c89dbbb50445b5a7625 SHA-256: 483b40480254fefd0d59343afd697e846f220b49867fe25bf79726623a4cf394

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 call. The JavaScript stream, named 'javascript_obj0007_000.js', is obfuscated and likely responsible for executing a malicious payload. The presence of `eval()` and `String.fromCharCode` strongly suggests code execution and obfuscation techniques are being employed to hide the script's true intent, which is presumed to be downloading and executing a second-stage payload.

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` `2a960008297acf505ee6bd6c0eb276b7ea53a3c4e8b59d822fc7802bd6183869`	pdf-javascript-stream	PDF /JS object 7 at offset 0x23F	75802 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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