PDF malware analysis — malicious · 44bf9d781f28e2ca

MALICIOUS

PDF

7.6 KB

MD5: 89a569b5e7d51f90f1f0a52bbe668391 SHA-1: 9417a4e50d4149a4b7585d4a5ea1ad04e5cdd75f SHA-256: 44bf9d781f28e2caac69374b5f9850496d10fc3930b6bf24adb3831e745174d7

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The JavaScript stream appears obfuscated, utilizing eval() and String.fromCharCode, which are common techniques for hiding malicious code. The primary function of this script is likely to download and execute a second-stage payload. Due to the obfuscation, the exact nature of the payload and its destination cannot be determined with high confidence.

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_obj0004_000.js` `c970605c1b0cc2151cd888655be785abe71edb447f02fbac8130482136319669`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	307 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`stream_002_off00001c12.js` `d31d04cae1fdca0517b76f096cc7179144db5a287335c24008e74b30b5733fd4`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1C12	311 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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