PDF malware analysis — malicious · 62b9d2837203ea82

MALICIOUS

PDF

2.1 KB

MD5: d6a06cbd3a93ac993576f6328feefbef SHA-1: 1c2fee5b763ef2736f11304f22a4c355877b3f8f SHA-256: 62b9d2837203ea82f7b3a361d256db0f7c18a8a8db63b520ea769badea2daf63

254 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious File

The PDF contains JavaScript that utilizes the exportDataObject and nLaunch functions to embed and automatically launch the EICAR test file upon opening. This is a common technique for delivering malicious payloads disguised as benign documents. The EICAR test file itself is embedded and referenced directly.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 7

exportDataObject + nLaunch — embedded-file launch-on-open dropper critical PDF_JS_EXPORT_LAUNCH_DROPPER

PDF JavaScript calls exportDataObject() with nLaunch set, which extracts the document's embedded file and launches it in its default application. This is a launch-on-open dropper: the embedded file is the payload. No benign workflow auto-launches an extracted PDF attachment.
ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
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

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`EICAR.txt` `275a021bbfb6489e54d471899f7db9d1663fc695ec2fe2a2c4538aabf651fd0f`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x62C	68 bytes
Detection ClamAV: Eicar-Test-Signature Obfuscation or payload: unlikely
`javascript_obj0008_000.js` `c79586b6ce33258a4a3246f592054a0720afaa39e08ec5d2fa6c2c1d19c42b91`	pdf-javascript-stream	PDF /JS object 8 at offset 0x4FF	58 bytes
`javascript_obj0008_001.js` `a99f0aad140b19a3f2f03812ca412c6d983fae48b9344738a95bf360fb8f644c`	pdf-javascript-stream	PDF /JS object 8 at offset 0x4FF	56 bytes
`combined_document_js_000.js` `199ba6b6d17851b5ae7a01a409ca7b2ee3b1ed01f3e9b137a2572738cc785da4`	deobfuscated-js	combined document JavaScript streams at offset 0x4FF	115 bytes

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