PDF malware analysis — malicious · 8a597d516c7e1c65

MALICIOUS

PDF

59.8 KB

MD5: 4100894b682da067f0bfff99b8581f11 SHA-1: 1f7f5fbe87b6fca4ee8f583ff39fbc8a06ec748c SHA-256: 8a597d516c7e1c65428013cc4546154bd7f790c793c49c93075f96ae6f7e0880

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript, indicated by PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream exhibits obfuscation, including eval() and unescape() calls, suggesting it's designed to hide malicious code. The presence of PDF_RICHMEDIA and PDF_FILTER_HEX further points to exploit activity. The extracted artifact 'legacy_pdfkit_stage_000.js' is likely the payload or a component thereof, and its deobfuscated nature implies it's intended to be executed.

Heuristics 9

RichMedia (Flash) high PDF_RICHMEDIA

PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector (matched inside decoded stream)
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://ns.adobe.com/xap/1.0/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/AcrobatAdhocWorkflow/1.0/

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0003.bin` `f0156a5c9cfac0444d237fb92b5b9731faaa34f807b3d583c1b88283feefed46`	pdf-embedded-file	PDF EmbeddedFile object 3 at offset 0xE17	26804 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.
`legacy_pdfkit_stage_000.js` `a6a68cec92c9ff48318a37483a59e2a964f15a3a86cc6c540ba4da0f3673d267`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x626	383 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`objstm_0019_00.bin` `35b8e7b98462e22f02646bbeed9ddb00a922cc58220f47cba5a22a13de5ca483`	pdf-objstm-decoded	PDF /ObjStm 19 0 obj (inflated)	6700 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 10 long base64-like blob(s).

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