PDF / .SWA malware analysis — malicious · 500dc9cbef6b569b

MALICIOUS

PDF / .SWA

11.5 KB Created: 2010-08-19 20:49:47 +04:00 Authoring application: Yee_c_ (via e58aea6)

MD5: dd8f71d0d421130503a44ef83eeb6ef1 SHA-1: b4f8d5347d2f052992dd9da48757b96a7a609598 SHA-256: 500dc9cbef6b569b7d2829aa27c44e4e8e445a74e6cea10599ce25774e53ca5c

104 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_EVAL'. The 'PDF_EVAL' and 'PDF_FROMCHARCODE' heuristics suggest the JavaScript is obfuscated and uses dynamic code generation. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be the execution of this obfuscated JavaScript, which is likely designed to download and execute a second-stage payload. Due to the obfuscation, the exact payload and its destination could not be determined.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 6

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. (matched inside decoded stream)
Optional Content Group with action trigger low PDF_OPTIONAL_CONTENT

Optional Content Group (layer) co-occurs with an action trigger — content can be selectively hidden from viewers or scanners while the action still fires on open
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0011_000.js` `4e5d323690b2b04b5973f65b64308a102b622aefe0237db30cfc4949e7541e22`	pdf-javascript-stream	PDF /JS object 11 at offset 0x2463	1140 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0013_001.js` `fcc2f0a9c1205d6bb99cb9a8cb4e190f2001894e322eca46c175a14f8b2c295e`	pdf-javascript-stream	PDF /JS object 13 at offset 0x26F6	491 bytes
`javascript_obj0015_002.js` `33400da911637c489e399cddc2743e7b18ef1e53ede7f877926b5e5cc44db629`	pdf-javascript-stream	PDF /JS object 15 at offset 0x289D	133 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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