PDF malware analysis — malicious · acdc4432254141fe

MALICIOUS

PDF

12.1 KB Created: 2010-10-21 10:04:43 +04:00 Authoring application: IboNd_v (via 8a47481ae5)

MD5: e562afa11ac50b0651e67d40f78b7514 SHA-1: b0ed090cac4087bb12a80b6df969057fb85608c7 SHA-256: acdc4432254141fe1844295b76a9544a3ea1eeb351762afe23c91699d348d0ad

106 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier strongly suggests maliciousness. The JavaScript is obfuscated and uses eval() and String.fromCharCode, making its exact function difficult to determine without further dynamic analysis. However, the presence of these elements points to an attempt to execute arbitrary code.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

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` `6052e37722d21cc09651bbf5257aa61b97e395cdcc633405ec858d4c699c77d7`	pdf-javascript-stream	PDF /JS object 11 at offset 0x2424	2459 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0013_001.js` `27205db797774bd49915c1c9383f618288f97404deb51e6befdfee2416caba3e`	pdf-javascript-stream	PDF /JS object 13 at offset 0x287E	1100 bytes
`javascript_obj0015_002.js` `351dcd8b24cc29c006af6ca0d781bdababbd9d011c08698b9995a7f74b22985c`	pdf-javascript-stream	PDF /JS object 15 at offset 0x2AED	301 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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