PDF malware analysis — malicious · 8cc8b1e395a4a3b8

MALICIOUS

PDF

9.5 KB

MD5: d77ad40b39c9fa30a3e98d2d04ad7928 SHA-1: 3c1f573716891506a82ff4ba4078c1e6357b2f4c SHA-256: 8cc8b1e395a4a3b84d229286b3f50f3a2aecca74ae137e5ed6cbf1486869ee7e

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1204.002 Malicious File

The PDF exploits CVE-2007-5659 using the `collab.collectEmailInfo` JavaScript primitive to execute a hex-decoded stager. This stager is responsible for downloading and executing a second-stage payload. The presence of multiple deobfuscated JavaScript files indicates a complex, multi-stage infection process. The attack pattern is consistent with a PDF-based exploit delivering a downloader.

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` `9f17df95bc71874fe0f2dcb9f0e8f529cdb3604910d27079f2fbde52cabda2a8`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	256 bytes
`annotation_subject_callee_hex_stage_000.js` `0815abdf2a1ed09cbd3bf2553f5086e60cefcfec996ca8a3a8356d8efd626c8a`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5128 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` `0afb4a29d8139a9f002dd3d16b3b595cf060a16f89ed953b2128b2bac696b7f9`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D0	12229 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` `46328aac8ce0d2822f331724932018ad002cbbb93776d38f5df9b71cecab7443`	deobfuscated-js	PDF JavaScript deobfuscation pass	73238 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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