PDF malware analysis — malicious · 9a19a2a1e01225ad

MALICIOUS

PDF

11.8 KB

MD5: ff329d96a962d78718d8ef83a5b6fedf SHA-1: 8b55f4c4a74c72aa5e22cabe62c6d8884a7294e2 SHA-256: 9a19a2a1e01225ada1cefbeca7b9f10350fb6d0ef1a976f005f8c0403bc93ecf

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF document contains embedded JavaScript, specifically leveraging the Collab.collectEmailInfo method to exploit CVE-2007-5659. This JavaScript is heavily obfuscated and hex-encoded, acting as a stager. The primary function of this stager appears to be decoding and executing a secondary payload, as indicated by the 'callee.toString()-keyed hex decoder before evaling' heuristic. The extracted JavaScript files (annotation_subject_callee_hex_stage_000.js, deobfuscated.js, legacy_pdfkit_stage_001.js) are evidence of this complex staging mechanism. The ClamAV detection further confirms its malicious nature.

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` `7d8fe504fbed9a2aef40180cb489547b421da77d8db27b48cc4250c2066578ea`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	4992 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` `4c2c2ac0fa0f7080052606bd8f0223937dd1e5b51f36fac4fb6480c9de6701e4`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	11926 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` `d87093b4bcf63867211539e4fce9711b48ae65305e4a1598092242e97e51aa6d`	deobfuscated-js	PDF JavaScript deobfuscation pass	71964 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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