PDF malware analysis — malicious · e470880b545b5baf

MALICIOUS

PDF

26.5 KB Created: 2010-03-14 16:18:33 Authoring application: hIQJstsRwX6MF (via wH4wHNMKeE)

MD5: 2290e63820f8159f6a0f19b9ccfee8fa SHA-1: 51eae49918a6c91ba5f99b40ddcc5952a4f60a3f SHA-256: e470880b545b5baf170bb286196e998e260925d8fe88272d1b1e2250a821cfcf

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 `eval()` and `String.fromCharCode` for obfuscation, suggesting an attempt to hide malicious code. The primary heuristic firing is PDF_EVAL, which is a strong indicator of malicious intent. The extracted artifact `javascript_obj0007_000.js` likely contains the obfuscated script responsible for downloading and executing a second-stage payload. The confidence is moderate due to the lack of specific IOCs like URLs or hashes within the provided evidence, and the obfuscation preventing a full analysis of the script's exact actions.

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` `f83148c72d20cf72b33f89730c6d63109452b631dfc4d0202422be093988a630`	pdf-javascript-stream	PDF /JS object 7 at offset 0x242	25946 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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