PDF malware analysis — malicious · 2391b625a90f5395

MALICIOUS

PDF

1.95 MB

MD5: da114b7fb90d0ea830e110b97e4289f9 SHA-1: 009ddc8f2b330ab557dbaaa1c906c3bb9f77cf1e SHA-256: 2391b625a90f5395fa3a9255afb0a91c6bd24919668438d09a06e143a638d06b

108 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 JavaScript

The PDF sample contains embedded JavaScript and triggers CVE-2007-5659 via the Collab.collectEmailInfo function. This indicates the document is designed to exploit a vulnerability to run arbitrary code. The ML classifier strongly flags this PDF as malicious, and the presence of obfuscated JavaScript streams further supports this assessment. The primary attack vector appears to be leveraging a known PDF vulnerability to execute a malicious script.

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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