PDF malware analysis — malicious · b12f020bac5458c0

MALICIOUS

PDF

27.8 KB Created: 2010-03-05 23:18:31 Authoring application: C2iLqUFwqV (via TBoI4)

MD5: aa9a0183f9c02c4d92d39a9b1b90b0f6 SHA-1: 02bd6ee0b5e7ff3ab2914fd4c77a4f59a38af3cc SHA-256: b12f020bac5458c05b6ca099cbbb82a07d2fd6d47c16c771ebd931662db43eba

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, extracted as javascript_obj0007_000.js, is heavily obfuscated. The primary function of this script appears to be downloading and executing a second-stage payload from a remote source, which is a common technique for malware delivery. Due to the obfuscation, the exact URL or execution method cannot be definitively determined, leading to a moderate confidence score.

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` `1605551de9611a015e1fc23db1be38e41f0fac6075ce28c28c4ec91e005f09cd`	pdf-javascript-stream	PDF /JS object 7 at offset 0x239	27251 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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