PDF malware analysis — malicious · a9a1637b63dbe14d

MALICIOUS

PDF

8.1 KB

MD5: e778b55a54d4db4f55b80a1da16bee9e SHA-1: 0d70259b591f43bf79823132149c28b07d6077a1 SHA-256: a9a1637b63dbe14df29e1c05e1c9a0761c451a30c2eaa6becbd1e567a9a81e8c

110 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that exploits CVE-2007-5659, specifically targeting the Collab.collectEmailInfo function. The JavaScript is obfuscated and appears to be designed to download and execute a second-stage payload. The ML classifier strongly indicates maliciousness. The extracted JavaScript files, 'javascript_obj0013_001.js' and 'legacy_pdfkit_stage_000.js', are likely components of this malicious chain.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659

PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
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.
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0001_000.js` `d019ba19e3716e8061cee87ae5126927674972121e587672abadc04f795b6c71`	pdf-javascript-stream	PDF /JS object 1 at offset 0xF	63 bytes
`javascript_obj0013_001.js` `3c9a00c835a3358275dcc16555521a5670fe897077f8687a0ff2e3119b55f396`	pdf-javascript-stream	PDF /JS object 13 at offset 0x395	15675 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `9fe4a8d0a22c334a93c7cfd5016906b7100b512822e24aa07f9e8143510914b5`	deobfuscated-js	reverse-string concatenation decoded JavaScript at offset 0x395	2043 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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