PDF malware analysis — malicious · 4a8ab007df13c62c

MALICIOUS

PDF

12.1 KB

MD5: cda93b5a5c9b876c9dcdad608678f805 SHA-1: 597ab4885b3a59d24f87c40b248dab48c1b9a5b7 SHA-256: 4a8ab007df13c62ced7f99ced6bc0e5d4f131ada66b4ed19b496e2b90006d754

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains multiple embedded JavaScript streams and triggers heuristics related to known PDF exploits, specifically CVE-2007-5659 (Collab.collectEmailInfo). The presence of deobfuscated JavaScript files suggests an attempt to hide malicious code. The primary attack vector appears to be the exploitation of a PDF reader vulnerability to execute this JavaScript, which likely downloads and executes a second-stage payload.

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` `e174ca72f994a8040d84e461a02d26bcb270bc17cdf28212b08014fe9aeb8373`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5177 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` `5c4980bdbd45a7f964df50603265588bd31b2e4667c5bf0178b8d8159d502b9b`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	12287 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` `305377bb6a8e38cc76a896a9daf9f90542a861e2d9327ebbecbdb3dbc56cd03a`	deobfuscated-js	PDF JavaScript deobfuscation pass	73167 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.