PDF malware analysis — malicious · c7e4f4c043d8cf71

MALICIOUS

PDF

12.0 KB

MD5: a9c66815a2aa1bc30137f9a38eeb68fe SHA-1: 91002ffc6ad51f994899a158ccf3c55328f93e5b SHA-256: c7e4f4c043d8cf710180e3ced2390e538dbeb2035f4068c1b4238973791882ce

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript, triggered by the CVE-2007-5659 vulnerability using the `collab.collectEmailInfo` function. The analysis recovered multiple JavaScript streams, including `annotation_subject_callee_hex_stage_000.js`, `legacy_pdfkit_stage_001.js`, and `deobfuscated.js`. These scripts are indicative of a stager designed to download and execute a second-stage payload. The presence of multiple deobfuscated JavaScript files suggests a complex, multi-stage attack.

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` `dbacbf0efbd1e4402ffa27b88eb57d055e36fd8e9c9ce2c91c0db29503cd1b11`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5145 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` `6c1f333fa7b06ab4a7f43c80f5ec131cc7d01fdf586b3fe06b2248b9f2a95fd1`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	12095 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` `9bc4985e3e60f0c915e297f623ebb67c891255f4076c63aa66563d30a7ce289e`	deobfuscated-js	PDF JavaScript deobfuscation pass	74854 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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