PDF malware analysis — malicious · dde63b7c5348220b

MALICIOUS

PDF

11.8 KB

MD5: dbaf477496bab93229a1897bb53c7dc8 SHA-1: 63c521620a8d47a4742286b9834ef7d066fa1793 SHA-256: dde63b7c5348220b2605e3e95da64199b915d18b0aa7ec82f1388ad4b2e0b517

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF document contains embedded JavaScript, specifically leveraging the CVE-2007-5659 vulnerability through the `Collab.collectEmailInfo` method. This technique is used to decode and execute a hex-encoded stager. The presence of multiple deobfuscated JavaScript files indicates a multi-stage loading process, typical of malware aiming to download and execute further payloads. The high risk score and ClamAV detection further support 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` `c0c02e5cdd345ab60d4efc7ac1c8f7cfad39bc53c40c3de826cc8d4fd19b153b`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5049 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` `44a01468932e49a6e6e98142f2c4c292df74e9bc6c17c46308bfffa3a2dafb60`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	11960 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` `190e53995e94998536442a39b4f3ea2259cb9fabc82e5f590cad5ef8d7bb3703`	deobfuscated-js	PDF JavaScript deobfuscation pass	68747 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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