PDF malware analysis — malicious · 8ecba32e21fa6cd9

MALICIOUS

PDF

70.1 KB Created: 2010-03-10 03:18:27 Authoring application: HRtIMQxVe4jDLh (via zWxYL)

MD5: 73368b25dc1ab28c2543226dc52b3054 SHA-1: 2ae4d59c26bd5d380597dc879027e5610e01b3e0 SHA-256: 8ecba32e21fa6cd9da12659743efaa42afed8f38680af2230e9c2973e6aed82f

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

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 and dynamic code execution. The high-confidence PDF_EVAL firing points to the execution of arbitrary code. The extracted artifact javascript_obj0007_000.js is likely the payload. The exact intent of the script is unclear due to obfuscation, but it is highly probable that it downloads and executes a second-stage payload.

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` `1f9edc7dd512165e31593589a44c1ffde0e018d078d94d6af4b5ac67075fbd9c`	pdf-javascript-stream	PDF /JS object 7 at offset 0x23D	70511 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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