PDF malware analysis — malicious · 9f62bf1e67fe7314

MALICIOUS

PDF

11.8 KB

MD5: 0cd8407db53e73a63a099a5c1ba42df1 SHA-1: 5f427bc9e66254b5f29f9ebcadb1eb5e9146cfa5 SHA-256: 9f62bf1e67fe731477ffd22f291492ed5ded5a342691bad152f6dd97674afa94

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious Link/Object

The PDF document contains embedded JavaScript, triggered by the CVE-2007-5659 exploit targeting the `Collab.collectEmailInfo` function. This JavaScript acts as a stager, decoding and executing a larger, obfuscated JavaScript payload. The primary function of this payload appears to be the download and execution of further malicious content, as indicated by the presence of large deobfuscated JavaScript files and the ClamAV detection signature 'Pdf.Exploit.Agent-36063'.

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 3

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` `b2e4be8c5faebae2de6d54e5484a2b83111ff7390e0d2cf73cbcb58a9ba5cef2`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	4971 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`deobfuscated.js` `2adf15e8592dad067b57e9c4e9d353e4b672066c26ccb7053d7d17263c7863ed`	deobfuscated-js	PDF JavaScript deobfuscation pass	75176 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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