PDF malware analysis — malicious · c6cf51f8c52f4345

MALICIOUS

PDF

2.6 KB

MD5: 4c364cd01b42d024b48f727b392ef569 SHA-1: 8862c92702920fe1ae1fc0ac05c4a5353e66e4eb SHA-256: c6cf51f8c52f4345fafbb38d551a2707b55db6a34cc8d87a47ef2fd083935d91

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 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 suspicious due to obfuscation indicators. The presence of eval() and String.fromCharCode suggests the script is designed to execute arbitrary code, likely downloading and running a second-stage payload. The lack of readable document body text means the specific lure cannot be determined, but the technical execution path is clear.

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` `448bf71f3ada21b54357b711a75d136c72afee9243999fd8fc4aebd90f039092`	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` `8d1c90e3136a1e23e71e5bb6ef1e9c829a27dd8253269ad8cb7eb2bd8baeab1d`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x268	3328 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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