PDF malware analysis — malicious · ecc34fbc57368c95

MALICIOUS

PDF

27.0 KB Created: 2011-72-51 03:25:00 Authoring application: String.fromCharCode

MD5: 8714f3401a1e63dddec9c185305ab722 SHA-1: 6abfa3d771336d55546f7b20e4810d33e30c998d SHA-256: ecc34fbc57368c95dfd9a5fc3f53b836d5d39f9c0442e1b04da5ceb51d5f4979

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream is obfuscated and uses `eval()` and `String.fromCharCode`, suggesting it's designed to hide its malicious intent. The primary function of this script appears to be downloading and executing a second-stage payload, as evidenced by the obfuscation and the use of `eval()`. The extracted artifact `javascript_obj0001_000.js` is also suspicious.

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_obj0001_000.js` `a9600f7b1c5dbcad8697c17c123c53779cb7a7e5c492485167b69b54c7829ed8`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	513 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).

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