PDF malware analysis — malicious · ed920e85d81c251e

MALICIOUS

PDF

44.8 KB

MD5: 75c73e65d8b06bcb18956d3a286238e3 SHA-1: bd4b2c67566f7a4e0d64eeb970c6542338ea4281 SHA-256: ed920e85d81c251ebf5c06f9a1cac4f6dfde1feefe3144a1027ac53a2bbc24d9

204 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1204.002 Malicious File

The PDF file contains embedded JavaScript, specifically triggered by the 'Collab.collectEmailInfo' method, which is indicative of CVE-2007-5659. This exploit is used to stage and execute further malicious code. The high-entropy carved artifact and deobfuscated JavaScript suggest a downloader or dropper functionality, likely fetching additional payloads from a remote source. The presence of U3D content also points to exploitability within Adobe Reader.

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.
Suspicious extracted artifact high 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.
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)

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0009_000.js` `5aa3057960874477e0379157bd0cd3422fe6540096e159cdca26941279272f56`	pdf-javascript-stream	PDF /JS object 9 at offset 0x44B3	442 bytes
`annotation_subject_callee_hex_stage_000.js` `18206d00151f88377c760e5a181d05f75aeca6386fbd53f3b8a50063e6622f57`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x1BF3	5606 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`deobfuscated.js` `f0259fd12c6955d40c2777095ca067ac817f02558283c7b8ce7765493beb0e69`	deobfuscated-js	PDF JavaScript deobfuscation pass	301198 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`u3d_00_off000046ed.bin` `fb27c6f6ffe2b08a88f79f344ef3cb4f85460ac81a062194b6fd84ab6e48b628`	pdf-3d-stream	PDF U3D 3D stream at offset 0x46ED	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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