PDF malware analysis — malicious · a6cf471aa492d816

MALICIOUS

PDF

12.0 KB

MD5: e8c456c51871f5f59e2c6634c4806369 SHA-1: 891b9a332a14af0bf12ffeb7c9bd89837fa6a7f8 SHA-256: a6cf471aa492d81698b7d4be180c1f9c1533ba2c0e0deee13b00d4d949ee8977

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that is obfuscated and designed to be executed via the CVE-2007-5659 vulnerability in Adobe Reader, specifically leveraging the 'collab.collectEmailInfo' method. The embedded JavaScript acts as a stager, with multiple deobfuscated JavaScript files recovered, indicating a multi-stage loading process. The primary attack vector is the exploitation of the PDF reader to download and execute further payloads.

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` `6bb2afb1643e0c979e61d80984bd86f8af247f8ebcf99c9294eb751370b12120`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5065 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` `a54c5831f47fcd31a7ba79bb5264cf5d0263d462d6ad1d67056762ed77f175a2`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	12119 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` `20d7dbf46d36c1c8c0a1573f2e8c25489732845e1a4f44fa8dff9c88442a5b69`	deobfuscated-js	PDF JavaScript deobfuscation pass	74184 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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