PDF malware analysis — malicious · 9da4745b8571a5e3

MALICIOUS

PDF

22.2 KB

MD5: 0dfa83309f20b174ada524cbad4432f8 SHA-1: 28e1a51ddb758d767d6ba20283a2ae27fcea0dfc SHA-256: 9da4745b8571a5e3533668453cf5e6db5b82ce73cc8f1554b9fa0723ed5e640f

94 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1059.003 Command and Scripting Interpreter: Windows Command Shell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings related to PDF JavaScript and decoding filters. The JavaScript stream, identified as 'javascript_obj3332_000.js', is likely responsible for the malicious behavior. The use of `unescape()` and `String.fromCharCode` suggests obfuscation, common in malware delivery. The primary attack pattern involves leveraging these JavaScript capabilities to execute a secondary payload, although the exact nature of that payload cannot be determined from the provided evidence.

Heuristics 7

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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)
ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85

ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
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_obj3332_000.js` `cb9b9d25fac45af8acf5581013b50b83ff981546116f35d9f693d8edc7b732ff`	pdf-javascript-stream	PDF /JS object 3332 at offset 0x55A9	482 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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