PDF malware analysis — malicious · 3c319a319448fede

MALICIOUS

PDF

11.7 KB

MD5: f4f2adb01a0f2603c150eda716e1aa27 SHA-1: cb3e7f09bd151f3df6ff09bf170dd6cb69e6181d SHA-256: 3c319a319448fedeafa2a3dcc0fa22aaa71a781314e9d87294c1ed0bedea31ef

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF document contains embedded JavaScript that is heavily obfuscated. Heuristics indicate the use of CVE-2007-5659, specifically targeting the `Collab.collectEmailInfo` method to stage and execute JavaScript. The recovered JavaScript appears to be a downloader, likely responsible for fetching and executing a secondary payload from a remote source. The `annotation_subject_callee_hex_stage_000.js` and `legacy_pdfkit_stage_001.js` files are significant artifacts of this exploit chain.

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` `d931fe03c47f925d644e9f316c17b13abd5626913ae07363d85585ea4d2af946`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	4964 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` `fe33fa6894e0cb7398ef6265de8d1d6a7110f1b1911f1ab640fbcb712ada2e89`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	11901 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` `eb2a28fc1564150f6e7cbcc267078887128e8ce1be451225406f8a907fe2cf4b`	deobfuscated-js	PDF JavaScript deobfuscation pass	73827 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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