PDF malware analysis — malicious · 55bdc4a540941c26

MALICIOUS

PDF

39.5 KB

MD5: f463ceb6a3691981975ff42a4dc54159 SHA-1: 74a1c736bd5663166d15c8d486ecd0204fdc9861 SHA-256: 55bdc4a540941c26dfc8d2c573077ebe7059681523ef095bda551ceeb6b5f0f7

226 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains critical heuristic firings indicating the exploitation of CVE-2007-5659 via the `collab.collectEmailInfo` function. This function is used to decode and execute a JavaScript stager. The stager is responsible for downloading and executing a second-stage payload, which is a common technique for malware delivery. The presence of U3D content and multiple JavaScript streams further supports the malicious nature of the file.

Heuristics 8

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.
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 5

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 0x1A4	273 bytes
`annotation_subject_callee_hex_stage_000.js` `5b455f0c75b0591c73af298fa647882d7bdd1a970aa98985b70d76f26708b819`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x151	5345 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` `082ba803e29d05408a556d60d44e279a921169050033e27ac8de98d96baebaac`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2DD	12725 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` `6b80e581e6beac8a70a432d1e73f74385f78515cfdb3d08f750897c594dec76e`	deobfuscated-js	PDF JavaScript deobfuscation pass	269728 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`u3d_00_off000031c2.bin` `db166b7bf539ceb527a321927dc7262838bbe91b146a4aa26884d46ee5696f20`	pdf-3d-stream	PDF U3D 3D stream at offset 0x31C2	27443 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.

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