PDF malware analysis — malicious · 4d17d352314fca3e

MALICIOUS

PDF

12.0 KB

MD5: d6eb1bf950327a9feb88feff3fa2b463 SHA-1: c85f7873004b6e69d06e2f0f119ef2de6abf50fd SHA-256: 4d17d352314fca3e8fb278ef666e64b973b4e62aef6db7d2c684151c90b967ed

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript and exploits the CVE-2007-5659 vulnerability via the `collab.collectEmailInfo` method. This JavaScript acts as a stager, indicated by the heuristic `PDF_ANNOT_SUBJECT_CALLEE_HEX_STAGER` and the presence of deobfuscated JavaScript files. The primary function of the script appears to be downloading and executing a second-stage payload, as suggested by the analysis of the embedded scripts and the ClamAV detection `Pdf.Exploit.Agent-36063`. The exact nature of the second-stage payload is not fully discernible from the provided evidence, leading to an 'unknown family' classification.

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` `db9dbb78be65fd89d7854038e0f6ba8d5deb9f6bf13ff2c7f4fee845a38677f2`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5118 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` `4d57b8c4fdaf10488d0dda87e1d72d32ece6765b6967540bd9cc90813fea8f85`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	12243 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` `07966be928ad2bbd1aa3c48ab88a5c954796a3eadce6a4fc126ff3ea91c59619`	deobfuscated-js	PDF JavaScript deobfuscation pass	74169 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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