PDF malware analysis — malicious · f2c8b0d8ceb6fd42

MALICIOUS

PDF

12.3 KB

MD5: b4d643b7ac32e0985881e7e0d504a17f SHA-1: 4193656936206419957761efa2367f29c2197543 SHA-256: f2c8b0d8ceb6fd423227b0911de5df19f2649f948fc2869c630f0ef4c6da99d5

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains multiple embedded JavaScript streams and triggers a critical heuristic for CVE-2007-5659 (Collab.collectEmailInfo). This indicates the file is designed to exploit a known PDF vulnerability. The embedded JavaScript, particularly the 'annotation_subject_callee_hex_stage_000.js' and 'legacy_pdfkit_stage_001.js' files, likely contains obfuscated code intended to download and execute a secondary payload. The presence of these exploit-related artifacts strongly suggests malicious intent.

Heuristics 7

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)
ClamAV: Pdf.Exploit.Agent-36063 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36063
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` `eb39e2de4dbbc100de6d3e30aa43ff78fa075618862ba1ebba5151ea3a3b848d`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	273 bytes
`annotation_subject_callee_hex_stage_000.js` `2ab6bbf42ed6822e031ba9c69ab8a9d82fd729d803ba4a462351e3f7eab65503`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5247 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` `d12f4039d87d1fe86706f1ce53a7299e70eb97fc05d76b03f73fc5dc96b27a41`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	12500 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` `4257e37d3d94206bc2986edf40b652d1d4e4d60823443fef495b7560a1fc79ab`	deobfuscated-js	PDF JavaScript deobfuscation pass	81633 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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