PDF malware analysis — malicious · d77437325ce4cd4d

MALICIOUS

PDF

850.8 KB First seen: 2020-05-25

MD5: 931ad9ea5eb97a0f72285ea511d9a48c SHA-1: e3559747d2eed506dbf5845cc869c4d5989bf764 SHA-256: d77437325ce4cd4df7912af1fc29dabe916ea9e0e543ed535c150097b30e5445

138 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and an embedded OLE object named 'mmm.doc'. The JavaScript actions and the embedded file suggest an attempt to deliver a malicious payload. The document body text is minimal and appears to be boilerplate related to the embedded object, not providing a clear lure. The presence of the embedded 'mmm.doc' file is the primary indicator of a potential secondary stage.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

JavaScript action low 2 related findings PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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.
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.
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
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://schemas.microsoft.com/office/word/2003/wordml Referenced by PDF JavaScript

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`mmm.doc`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0x560	434683 bytes
SHA-256: `ccad64df15ccbe6b69e361bed7e56e04206ac3c60873ecab47dc15ed7d79ec83`
Detection ClamAV: No threats found Obfuscation or payload: likely 788 of 2141 identifiers look randomly generated (e.g. 'ffffffffffffffffffffffffffffffffffffffff'); 25 string-concatenation chain(s) — consistent with name-mangling obfuscation. Carved artifact contains 79 long base64-like blob(s).
`javascript_obj0009_000.js`	pdf-javascript-stream	PDF /JS object 9 at offset 0xD496E	56 bytes
SHA-256: `ed061ab592112ad55c254b426dafc2c2db9e4e9f33450d4021a0931f6c615736`
Preview script First 1,000 lines of the extracted script this.exportDataObject({ cName: "mmm.doc", nLaunch: 2 });
`javascript_obj0009_001.js`	pdf-javascript-stream	PDF /JS object 9 at offset 0xD496E	54 bytes
SHA-256: `b56c9a59f94f394983ab8fcf586f9c2e9f3c597311aba4461690252a02524028`
Preview script First 1,000 lines of the extracted script this.exportDataObject({ cName: "mmm.doc", nLaunch: 2 }
`combined_document_js_000.js`	deobfuscated-js	combined document JavaScript streams at offset 0xD496E	111 bytes
SHA-256: `7dc1569570614bd5a97c47dd05a4740a26b8540426fbe6acd7775b0472c03a5a`
Preview script First 1,000 lines of the extracted script this.exportDataObject({ cName: "mmm.doc", nLaunch: 2 }); this.exportDataObject({ cName: "mmm.doc", nLaunch: 2 }

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