PDF malware analysis — malicious · 4f4808384ea605a3

MALICIOUS

PDF

9.4 KB

MD5: c07905793b99683b1221ed343ce65f7f SHA-1: 822819aa62f0a4ed283bab62832333d39df80446 SHA-256: 4f4808384ea605a326d7a43c94566728617ef6707e2d4c16b2b505f2405011ee

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains multiple embedded JavaScript streams, including a large, deobfuscated one. Heuristics indicate the use of CVE-2007-5659 (Collab.collectEmailInfo) and a hex stager, suggesting the script is designed to download and execute a secondary payload. The presence of obfuscated JavaScript and the ClamAV detection for 'Heuristics.PDF.ObfuscatedNameObject' strongly indicate malicious intent, likely for a downloader or dropper.

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: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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` `11b03694c4e705ab29873cc5e2c55342ee498b376ac2dc5f05ce17018ef44c38`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	264 bytes
`annotation_subject_callee_hex_stage_000.js` `6f142fdbd127b4588844c5f97561175b4019930263f14b82c595f06c980d9133`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5097 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` `a4e56af2e5bb3390c55e9b5ee5bf0acedf610e2d15c18f8a693c02ddb88070ec`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2CC	12124 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` `ad627cd9d0017fb1bf8e749866870325258cec7d599db19245d796ef0f5c7fe9`	deobfuscated-js	PDF JavaScript deobfuscation pass	67904 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

Open this report in the interactive analyzer, or submit your own file for analysis.