PDF malware analysis — malicious · b73c9e76787e679f

MALICIOUS

PDF

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

MD5: 66268d317abfd1fb0227ad14b27663c9 SHA-1: ee1f4d0f7e3ea24c2c439c2adf485cea77e6e846 SHA-256: b73c9e76787e679f9986e194283cce19abae758cb2e2566e90e7f3acf6b183db

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 utilizes `String.fromCharCode` and an `eval()` call, suggesting obfuscation to hide its malicious intent. The primary function of the script appears to be downloading and executing a second-stage payload, as evidenced by the `javascript_obj0001_000.js` artifact. This points to a common delivery mechanism for malware.

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` `a38730317efe5ed253c472d0d0820bfca7ca08f948578132d8dfd5ce360331bd`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	522 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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