PDF malware analysis — malicious · 2687b235902fbc85

MALICIOUS

PDF

45.1 KB

MD5: 9c53c6683620fe9af616d235d5ab641d SHA-1: 47e70081db29bd418323b588b4951be36d1f2460 SHA-256: 2687b235902fbc85539353b55ef8faea239c2d22c82d88e4c69694ade21d3cec

166 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell

The PDF file contains embedded JavaScript and exploits CVE-2007-5659 via the `collab.collectEmailInfo` function. This indicates an attempt to execute arbitrary code. The presence of multiple JavaScript streams and a U3D content indicator further supports a malicious intent, likely involving the download and execution of 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)
U3D/3D content in PDF — Adobe Reader 3D parser CVE-family indicator high CVE related PDF_U3D_CVE_RELATED

PDF contains U3D (Universal 3D) or 3D annotation content — CVE-2011-2462 and CVE-2009-3953 are critical vulnerabilities in Adobe Reader's U3D processing that allow arbitrary code execution. U3D content in PDFs is extremely rare in normal documents.
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 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0009_000.js` `b5dadd29c00c6c92b83fe9a317dd0f2511505b004ab2437a5a0a4eaea86c4a51`	pdf-javascript-stream	PDF /JS object 9 at offset 0x45BD	497 bytes
`annotation_subject_callee_hex_stage_000.js` `30b9f3bbd99b20bbbd47cea7322e87e76acb95179702c164b1437e5838cda34c`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x1BCF	5583 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `f7c2d0f6a60a2eee37921209e5283f7c45f3bbf85c0d6dee3e47d80464e079d9`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1C23	12521 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`deobfuscated.js` `d19cf573109190c45b84a97ebcbf46e35af453e6f1a84f07891c2c37ed648083`	deobfuscated-js	PDF JavaScript deobfuscation pass	312079 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`u3d_00_off00004800.bin` `a96e1fca2499edf504d3934052ca1fc338d4b4898a65e6a361937ed1ba0dc0fe`	pdf-3d-stream	PDF U3D 3D stream at offset 0x4800	28021 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.79, consistent with packed or encrypted content.

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