PDF malware analysis — malicious · 318dbda745935343

MALICIOUS

PDF

59.2 KB

MD5: 8693d42fb0b118f5886eaf8a025c5d31 SHA-1: 4e17e81e867234169f6f75b9b278aa28722e0e5a SHA-256: 318dbda745935343d65b16e6f8ede3222fa14f8a958d8baa82b9d63b7960a61b

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript and RichMedia (Flash) content, with high-confidence heuristics indicating eval() and unescape() calls. The presence of 'legacy_pdfkit_stage_000.js' suggests the script is designed to deobfuscate and execute further malicious code. This points to a common pattern of PDF-based malware delivery, where the initial file acts as a loader for a second-stage payload.

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 0xBB6	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` `4ad792e2ea1ca80101deac8f07bc8322f1d5f79994efcba3009b63eaf3a0ad4b`	pdf-objstm-decoded	PDF /ObjStm 19 0 obj (inflated)	3565 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 10 long base64-like blob(s).

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