PDF malware analysis — malicious · f5f1dd279af07563

MALICIOUS

PDF

16.3 KB Created: 2010-03-17 03:18:42 Authoring application: oZ72chJhVczRj (via wLQxjTFI)

MD5: 79b63b76aa2deb80f157577e0fa57b4c SHA-1: d6cf86ee5a744185a555f18a19d616e0cf75ce21 SHA-256: f5f1dd279af07563a544bdd30051174cbacef256035bc64243a12a0cb2a29435

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_EVAL heuristic firing suggests the use of eval() for obfuscation, and the presence of String.fromCharCode further supports this. The extracted artifact 'javascript_obj0007_000.js' is likely the obfuscated script. The script's intent is to download and execute a second-stage payload, though the exact URL or execution method is not directly discernible from the provided evidence.

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` `e4c5f4154d6e57c10a09f31b4627f0aadd88b4eca3908391962cf706c0378079`	pdf-javascript-stream	PDF /JS object 7 at offset 0x243	15445 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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