PDF malware analysis — malicious · dc9023d227aec6c9

MALICIOUS

PDF

9.7 KB

MD5: ce07e5f8f273c855cb19431427b9d69c SHA-1: 0e87251653260dd10f71632788bd5207071dc42d SHA-256: dc9023d227aec6c98815fd83a1a1033a0003991eb6a868dea9b5b9d4e95ad323

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF sample contains multiple embedded JavaScript streams, with a critical heuristic identifying the use of CVE-2007-5659 via the Collab.collectEmailInfo method. This technique is used to decode and execute obfuscated JavaScript, which is likely responsible for downloading and executing a second-stage payload. The presence of multiple deobfuscated JavaScript files further supports this analysis.

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` `51b44e80ac261e24109ea5629c62b80ebc4241ec2b51a4e7a8666bf01d699a73`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5224 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` `430a2f26ab2892d8ae6d6a4b523e108f1d5a9df152e5077c3024947ac85a564d`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2CA	12316 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` `86ec1614a15ab4e723a4606eb0eef9111c1a70e176ab4e4a52b83949d7c22e07`	deobfuscated-js	PDF JavaScript deobfuscation pass	45174 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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