PDF malware analysis — malicious · c8e3fc5653b41258

MALICIOUS

PDF

11.9 KB

MD5: dcb522ceaae3afd0cc2d4fc89af6983f SHA-1: 6a82b5e93ab25a969441e42b7bf1607d39ed08f3 SHA-256: c8e3fc5653b412589fcce627fb1b1f85f21d5f27112d1113e4603bea4b3de301

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious File

The PDF file contains embedded JavaScript that is heavily obfuscated. Heuristics indicate the use of the CVE-2007-5659 vulnerability (Collab.collectEmailInfo) to execute a JavaScript stager. This stager is responsible for downloading and executing a second-stage payload, as suggested by the presence of multiple deobfuscated JavaScript files and the ClamAV detection signature 'Pdf.Exploit.Agent-36063'. The attack pattern involves luring the user into opening a malicious PDF which then exploits a known vulnerability.

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` `025c4709c38772b6cb7fc6c3f296f2e358c8c11dda281d5504ff73c530ff4f58`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5081 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` `758b9549e515f2cfc93caa7cbbb346d9daf4152d5609871b22ddeb21437303ce`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	12186 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` `ca076d21919f7a8df286456be2b18b50d62f74f9c527d7461379588689fd2a03`	deobfuscated-js	PDF JavaScript deobfuscation pass	83048 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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