PDF malware analysis — malicious · 27c8ec39708ecd64

MALICIOUS

PDF

12.1 KB

MD5: a22f056dbe84fe9653e521d86464b5d2 SHA-1: 17332f7ee66de54c07bcb4787847e1e2bd410fb8 SHA-256: 27c8ec39708ecd644a04e0eb625df1e769e9e812ee14c97351138ac024870290

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains multiple embedded JavaScript streams, with a critical heuristic identifying the CVE-2007-5659 exploit targeting the `collab.collectEmailInfo` function. This exploit is used to execute a hex-encoded JavaScript stager found within an annotation's subject. The deobfuscated JavaScript is substantial, indicating it likely downloads and executes a second-stage payload. The presence of multiple deobfuscated JS files suggests a complex multi-stage attack. The family is unknown due to the generic nature of the exploit and lack of specific indicators.

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` `9096185758c61bfb0c16e6239e71b42fc783463554c60c1dd4fc36b107363c75`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5161 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` `2add4c23bc893d4ee2899447668ebf5c6d90649e9c4e642d414ba564ca59112a`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	12292 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` `a4a190952e169af1ef1a7a3773635d6105c8c91815502daef2f2d8213937196f`	deobfuscated-js	PDF JavaScript deobfuscation pass	79840 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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