PDF malware analysis — malicious · 26693f4ff3b04feb

MALICIOUS

PDF

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

MD5: 80209a00538245d2ac308cc9d08e9286 SHA-1: 85c107d9d76aa7ee3476f2ec82d34ca21dc5b6b3 SHA-256: 26693f4ff3b04feba7227c98394170b3492313a4d286e47ef210c4b75b22f057

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious File: Malicious File

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream utilizes `eval()` and `String.fromCharCode` for obfuscation, a common technique for hiding malicious code. The primary heuristic firing, PDF_EVAL, strongly suggests that the script attempts to execute arbitrary code. The embedded artifact `javascript_obj0001_000.js` is also flagged as suspicious due to script obfuscation. The overall intent appears to be the execution of a second-stage payload, though the specific mechanism is obscured.

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` `071627c172d4b9337876d70785b76d677e815622fe78b3a69447a9c4b19ef024`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	518 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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