PDF malware analysis — malicious · d4bc1de5416d6c3e

MALICIOUS

PDF

12.0 KB

MD5: d386a00be1300ac3bee0ef0610d4678f SHA-1: 80000ae5f6dfc5f5f28ae483c0fc151ffe376837 SHA-256: d4bc1de5416d6c3e43e01031e2d49203ea8d94be9a112206ef047c93f0fdd6ba

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF document contains embedded JavaScript that is obfuscated and hex-encoded, designed to be executed as a stager. Critical heuristics indicate the use of CVE-2007-5659, specifically the 'collab.collectEmailInfo' method, to achieve this execution. The recovered JavaScript is likely responsible for downloading and executing a second-stage payload. The presence of multiple deobfuscated JavaScript files suggests a complex, multi-stage infection process.

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` `1b980b7604f4011aa750ee342560c5a4d7ab65c383d57122b33c185387cb70c6`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5162 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` `41b177e7b20510abf668f4b348c0ce1d28d2f03bd54ffcf12d7188fcb1f802ad`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	12259 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` `de3a399ba8b18a2ee706c2130c611f9d185ba85d52317676d32a9a60c377a010`	deobfuscated-js	PDF JavaScript deobfuscation pass	75115 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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