PDF malware analysis — malicious · f81ef2a2ced73e5f

MALICIOUS

PDF

2.6 KB

MD5: 68e2ddc4915f8ec855ec239eab786027 SHA-1: 3bedec7261b75491dc9cb18f7e0f3eb47808a3eb SHA-256: f81ef2a2ced73e5faea7b827264d6f4105a2d6955c1ab3b53a9431f2f05d4b21

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 PDF_EVAL. The JavaScript streams, named javascript_obj111611_000.js and javascript_obj111612_001.js, are obfuscated and likely contain code to download and execute a second-stage payload. The use of eval() and String.fromCharCode() further suggests malicious intent to dynamically construct and run code. The document body is unreadable, providing no contextual clues.

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. (matched inside decoded stream)
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111611_000.js` `a0ace236590209466929313a7b41924d2294e813a1721b2bcdc42c4d16739647`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x197	258 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111612_001.js` `aa82395fec045ddc53f2cd4d2c6d3c27665afdb69614a874f91aa73ba6a18462`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x268	3296 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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