PDF malware analysis — malicious · 1cbbab7a2f689f29

MALICIOUS

PDF

9.6 KB

MD5: eb5642e1dfce5044725977078feb555d SHA-1: 72f73637ddb24f6725588b4afb5d8b13c7f3f45c SHA-256: 1cbbab7a2f689f29d9fe8aac16cec821a351604b56a0d3ee99b1dc5f03a3de95

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains multiple embedded JavaScript streams, with a critical heuristic identifying the use of CVE-2007-5659 through the 'Collab.collectEmailInfo' method. This indicates the document is designed to exploit this vulnerability to execute arbitrary code. The embedded JavaScript is heavily obfuscated, but the primary function appears to be staging and downloading a secondary payload, as suggested by the heuristic 'PDF_ANNOT_SUBJECT_CALLEE_HEX_STAGER'. The large size of the deobfuscated JavaScript further supports this.

Heuristics 6

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)
Annotation subject callee-key hex JavaScript stager high PDF_ANNOT_SUBJECT_CALLEE_HEX_STAGER

PDF JavaScript uses syncAnnotScan()/getAnnots() to read an indirect annotation /Subject stream, percent-decodes it through marker replacement, then uses a callee.toString()-derived key to decode and eval the final exploit stage.
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.
syncAnnotScan annotation-staging primitive low PDF_FOXIT_SYNCANNOTSCAN

PDF JavaScript calls syncAnnotScan() — a no-op annotation-enumeration primitive used by exploit-kit JavaScript to stage payload reads from annotation /Subject fields before eval(). Not a vulnerable sink itself; rarely seen in legitimate PDFs. (matched in decompressed stream)
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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `b9a85ee399db318b3ad68d0755effe289a645a7404fad2094712c8a3fd042920`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	244 bytes
`annotation_subject_callee_hex_stage_000.js` `7a144649d7fb8d0b327d403adcbb44aa23647c3d90b5f2e196af4956ac549b7a`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5188 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `2cbdc401722f3e9c10bd669c3d75019352bae77ba3a0b8e46ee0427444a8a8ce`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2CA	12276 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`deobfuscated.js` `0b4a7ec4d31c290b7dd0565acfe6a98c065de8601be83f1b50feae951c149011`	deobfuscated-js	PDF JavaScript deobfuscation pass	44895 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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