PDF malware analysis — malicious · ea1d0fcf9e6b3b54

MALICIOUS

PDF

12.8 KB Created: 2009-02-19 14:45:49 -02:00 Authoring application: Writer (via OpenOffice.org 3.0)

MD5: 605652119cf8a010d30c02f0c484a214 SHA-1: e3020e7f78d7f94983668bc9fec0acceaf365e97 SHA-256: ea1d0fcf9e6b3b54e6ae88999944436b907b31d0ff7385664158badf06ce9642

106 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The eval() call and String.fromCharCode usage within the JavaScript stream suggest code obfuscation and execution. The primary function of this script appears to be the execution of arbitrary code, likely to download and run a second-stage payload, as evidenced by the 'Suspicious extracted artifact' heuristic. The file's structure and the nature of the script point towards a malicious downloader.

Heuristics 6

Launch action high PDF_LAUNCH

PDF contains a /Launch action with an unresolved or extension-less target — treat as potentially dangerous
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0025_000.js` `ac22032783a8a6b00c7a1f4f658cd8f09a8eb7ff4c648294068e360b2b5c13ca`	pdf-javascript-stream	PDF /JS object 25 at offset 0x21AD	16267 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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