PDF malware analysis — malicious · 277a69662b49d780

MALICIOUS

PDF

35.1 KB Created: 2010-03-15 04:18:31 Authoring application: BfHTuesZK (via TNwsteRvDI9pK)

MD5: 7a1a330e8d1c009e6f77cdc8b4559acd SHA-1: c6cd673596dbc27c6c234fdc294358b8176dc020 SHA-256: 277a69662b49d78033a44d76cb4ebd96b1eff7ac4533d257dba7f6af75f5d864

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 `eval()` and `String.fromCharCode` for obfuscation, a common technique to hide malicious code. The primary heuristic firing is PDF_EVAL, suggesting the script is designed to execute arbitrary code. While no specific URLs or further payloads were directly extracted, the presence of obfuscated JavaScript strongly implies the intent to download and execute a second-stage payload. The extracted artifact `javascript_obj0007_000.js` is also flagged as 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_obj0007_000.js` `7638de83c60f5de44f684157809f33cb7e473c513f38e296d3b3b010f63c1ede`	pdf-javascript-stream	PDF /JS object 7 at offset 0x23F	34696 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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