PDF malware analysis — malicious · bc5356b5f284229b

MALICIOUS

PDF

11.9 KB

MD5: 0a50617ccad0ef4b41bd9f614e8e2c7f SHA-1: ce4d4b46da761263462d3ebe32ba3ba2c7a6fb64 SHA-256: bc5356b5f284229b5a2fa86c9b7814780224ca851f4c5eb38b72e91e3d52b4fe

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link or Macro: User Execution - Exploitation for Public-Facing Application

The file is a PDF containing embedded JavaScript, identified as a stager for CVE-2007-5659. The critical heuristic 'CVE_2007_5659: Collab.collectEmailInfo' indicates the exploitation of this specific vulnerability. The embedded JavaScript is heavily obfuscated but ultimately decodes and executes a payload. The presence of multiple JavaScript streams and the 'annotation_subject_callee_hex_stager' heuristic strongly suggest the primary function is to download and execute 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 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` `a29b7e3b5e072b9491b0c7c9bb7e6da2f80286a280eadb85c64640b8546464d8`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5060 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`deobfuscated.js` `08ff19f0fd19e4c0490b5f32600429641989388a14aa91c0856f6c85fbdd2f21`	deobfuscated-js	PDF JavaScript deobfuscation pass	77083 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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