PDF malware analysis — malicious · d05bc91c8cb7e451

MALICIOUS

PDF

12.1 KB

MD5: cbe3002f66054d3dd6ceda40b027d6f6 SHA-1: 33c494b90b1014c513cf2117c2fbe0ba204004ed SHA-256: d05bc91c8cb7e451388c5727dc2bd982b1528c1823869ef8e8df03067a82731f

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains multiple embedded JavaScript streams and triggers heuristics related to PDF exploits, specifically CVE-2007-5659. The presence of 'annotation_subject_callee_hex_stager' and 'CVE_2007_5659' heuristics indicates the use of a known vulnerability to execute JavaScript. The extracted JavaScript files, particularly 'deobfuscated.js', are likely responsible for the malicious payload delivery.

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` `64b978b0e9b137262dc654dfed82583f772ccd10076194d3b481989e0d7234b6`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5224 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` `7c9a421a6f902e9c028fd1c21eb2da62c65ffd88cd08a2705c42a69db071a7e6`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	12374 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` `fb20a7e7eb02590eb4d42417fbae39dec115c178bdb2b1a47e7ab564b9a8a7fc`	deobfuscated-js	PDF JavaScript deobfuscation pass	79630 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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