PDF malware analysis — malicious · 4a3663890922ab01

MALICIOUS

PDF

12.3 KB

MD5: f8f4794f4d9d1ea495ca71fe22d1df0b SHA-1: 335d78c116a55fd9005eeaa8a137e843136bbc32 SHA-256: 4a3663890922ab016dd8ed9a2e8052ebdb4b20d3b79a6fc17bdf6448537570ab

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file contains embedded JavaScript that is obfuscated and staged, indicating malicious intent. The critical heuristic 'CVE_2007_5659: Collab.collectEmailInfo' points to the exploitation of a known vulnerability to execute this script. The script's purpose is to download and execute a second-stage payload, as suggested by the presence of multiple deobfuscated JavaScript files and the 'Pdf.Exploit.Agent-36063' ClamAV detection. The attack pattern involves luring the user into opening a malicious PDF that exploits a reader 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` `e2a4fbfab42d9809eb5e4ad114de68dfad4bc1515a95e68dffff531eb63e9a5d`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5354 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` `7a66b198c4ef5a8b6b30518e5586b0fefe41bdf5a5397941ed41ef9a641f2ba9`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	12695 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` `73bfa8e59a531db963c0b94e7d718b140c29e3a1de2d24bccc6d2d0333b16778`	deobfuscated-js	PDF JavaScript deobfuscation pass	82471 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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