PDF malware analysis — malicious · dcb1ab6b993b7a16

MALICIOUS

PDF

18.0 KB Created: 2010-03-14 00:18:32 Authoring application: whZwrzTHUea3Mr (via VYDdKZlhkK0)

MD5: 52a5edb440a7e29b59d1e19f169a51e5 SHA-1: 5e3d23e5cf3158c549ba45db1d7fbc0450d63f5e SHA-256: dcb1ab6b993b7a16f206e6825b1eac3ff2d2dc55ccaf48686172a5561a810ada

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_EVAL heuristic firing suggests that the JavaScript code is being executed, likely to download and run a second-stage payload. The presence of obfuscated JavaScript and the use of String.fromCharCode further support this. The extracted artifact 'javascript_obj0007_000.js' is the embedded script.

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` `20401093028283012cf0a179aa134b1077354aaad725af30577ec1e4b66664f8`	pdf-javascript-stream	PDF /JS object 7 at offset 0x247	17231 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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